Dermatology Flashcards

(139 cards)

1
Q

Pathophysiology eczema

A

Defects in skin barrier
Entrance for irritants, microbes and allergens
Can stimulate an immune response
Inflammation and associated symptoms

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2
Q

Distribution of eczema

A

Face and trunk in infants
In younger children extensor surfaces
In older children flexor surfaces and creases of face and neck

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3
Q

Management of eczema

A

Avoid irritants
Emollients
Topical steroids
Wet wraps and oral cyclosporine in severe cases

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4
Q

Severe eczema management

A
Zinc-impregnated bandages
Topical tacrolimus
Phototherapy
Systemic immunosuppressants
Oral corticosteroids
Methotrexate
Azathioprine
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5
Q

Management of eczema flares

A

Thicker emollients
Wet wraps
Treating infections

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6
Q

Eczema trigger

A
Cold air
Dietary products
Washing powders
Cleaning products
Emotional event or stresses
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7
Q

Thin emollients

A
E45
Diprobase
Oliatum cream
Aveeno cream
Cetraben cream
Epaderm cream
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8
Q

Thick, greasy emollients

A
50:50 ointment
Hydromol ointment
Diprobase ointment
Cetraben ointment
Epaderm ointment
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9
Q

Side effects of topical steroids

A

Thinning of skin, more prone to flares, bruising, tearing, stretch marks, enlarged blood vessels (telangiectasia)

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10
Q

Mild steroids topical

A

Hydrocortisone

0.5-2.5%

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11
Q

Moderate topical steroids

A

Betamethasone valerate 0.025% (Betnovate)

Clobetasone butyrate (Eumovate)

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12
Q

Potent topical steroids

A

Fluticasone propionate 0.05% (Cutivate)

Betamethasone valerate 0.1% (Betnovate)

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13
Q

Very potent topical steroids

A

Clobetasol propionate

0.05% (Dermovate)

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14
Q

Eczema herpeticum causes

A
HSV 1 (more common) or 2
Varicella zoster virus 
Severe primary infection of skin
Seen in children with atopic eczema 
Rapidly progressing painful rash
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15
Q

Presentation of eczema herpeticum

A
Widespread, painful, vesicular rash
Rapidly progressing rash
Monomorphic punched-out erosions (1-3mm)
Fever, lethargy, irritability, reduced oral intake 
Lymphadenopathy
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16
Q

Management of eczema herpeticum

A

Viral swabs of vesicles

IV aciclovir

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17
Q

Complications of eczema herpeticum

A

Life-threatening

Bacterial superinfection

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18
Q

Psoriasis presentation

A
Dry, flaky, scaly, rough 
Faintly erythematous skin lesion
Raised plaques
Over extensor surfaces
Elbows, knees, scalp 

Rapid generation of new skin cells, abnormal buildup and thickening of skin in those areas

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19
Q

Plaque psoriasis

A

Thickened erythematous plaques with silver scales
Commonly seen on the extensor surfaces and scalp
1cm-10cm in diameter
Most common form of psoriasis in adults

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20
Q

Guttate psoriasis features

A

More common in children and adolescents
Precipitated by a streptococcal infection 2-4weeks prior to lesions appearing

Tear drop papules on trunk and limbs
Turn into plaques over time

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21
Q

Guttate psoriasis management

A

Resolves within 3-4months
Phototherapy
Tonsillectomy
Topical agents

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22
Q

Pustular psoriasis

A

Systemically unwell
Pustules form under areas of skin
Immediate admission to hospital

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23
Q

Erythrodermic psoriasis

A

Extensive erythematous inflamed areas covering most of the surface area of the skin
Skin comes away in large patches
Raw exposed areas
Medical emergency requiring admission

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24
Q

Specific signs associated with psoriasis

A

Auspitz sign: small points of bleeding when plaques are scraped off
Koebener phenomenon: development of psoriatic lesions in areas of skin affected by trauma
Residual pigmentation of skin after lesions resolve

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25
Management of psoriasis
``` Psychosocial support Topical steroids Topical vitD analogue (calcipotriol) Topical dithranol Phototherapy with narrow band UV B light ``` Specialist: methotrexate, cyclosporine, retinoids, biologic medications
26
Complications/ associations of psoriasis
Nail psoriasis: nail pitting, thickening, discolouration, ridging, onycholysis Psoriatic arthritis Psychosocial CVD: obesity, hyperlipidaemia, HTN, T2DM
27
Pathophysiology of acne vulgaris
Chronic inflammation and swelling in pilosebaceous unit—>form comedones From Increased production of sebum, trapping of keratin, blockage of pilosebaceous unit Androgenic hormones increase production of sebum Propionibacterium acnes bacteria
28
Features of acne vulgaris
Comedones due to a dilated sebaceous follicle: open top is whitehead, closed top is blackhead Follicle bursts releasing irritants: papules, pustules Excessive inflammatory response: nodules, cysts Scarring: ice pick scars, hypertrophic scars, rolling scars Drug-induced acne is monomorphic Acne fulminans: systemic upset, hospital admission, oral steroids
29
Classification of acne vulgaris
Mild: open and closed comedones with/without sparse inflammatory lesions Moderate: widespread non-inflammatory lesions and numerous papules and pustules Severe acne: extensive inflammatory lesions, nodules, pitting, scarring
30
Management of acne vulgaris
Single topical therapy: topical retinoids, benzoyl peroxide Topical combination therapy: topical antibiotics (clindamycin), benzoyl peroxide, topical retinoid Oral antibiotics or COCP Oral isoretinoin
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Topical benzoyl peroxide acne
Reduces inflammation Helps unblock skin Toxic to P.acnes bacteria
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Topical retinoids acne
Chemicals related to vitamin A | Slows production of sebum
33
Oral antibiotics acne
Tetracyclines: lymecycline Contraindicated in pregnancy/ breast feeding/ <12 Erythromycin used in pregnant Use for 3 months maximum Always prescribe with topical retinoid or benzoyl peroxide to prevent resistance Complications of long-term ax use: gram-negative folliculitis, treat with high dose oral trimethoprim
34
COCP acne
Dianette (co-cyrindiol) Increases VTE risk Only give for 3 months, second-line
35
Oral isoretinoin acne
Last-line options Pregnancy is a contraindication,Need contraception Roaccutane
36
Side effects of oral isoretinoin
Dry skin and lips Photosensitivity of skin to sunlight Depression, anxiety, aggression, suicidal ideation Stevens-Johnson syndrome and toxic epidermal necrolysis
37
Human papilloma virus
Infects keratinocytes of skin and mucous membranes Carcinogenic 6&11 genital wards 16&18 cancer, cervical cancer
38
HPV vaccination
12-13year olds in year8 will be offered 2 doses Daughter may receive vaccine against parental wishes Protects against 6,11,16,18
39
Management of genital warts | HPV
First line Multiple, non-keratinised warts: topical podophyllum Solitary, keratinised warts: cryotherapy Second line: Imiquimod topical cream
40
Impetigo
Superficial bacterial infection Staphylococcal aureus bacteria or strep pyogenes Complication of eczema, scabies or insect bites Common in children in warm weather Contagious, need school exclusion until lesions are crusted and healed or 48hours after antibiotic treatment
41
Impetigo features
Face, flexures and limbs not covered by clothing | Golden crust, around mouth
42
Impetigo spread
Direct contact with discharged from the scabs of an infected person Spreads by scratching to other sites Incubation 4-10days
43
Non-bullous impetigo
Typically occurs around nose or mouth Systemically well Golders crust from dried exudate
44
Management of non-bulbous impetigo
Antiseptic cream (hydrogen peroxide 1%) first line Second line topical antibiotic creams: Topical fusidic acid Topical mupirocin if resistant Extensive disease: Oral flucloxacillin Oral erythromycin is penicillin-allergic School exclusion: Until lesions are crusted and healed Until 48 hours after ax treatment
45
Bullous impetigo
Staphylococcus aureus infection Epidermolytic toxins that break down proteins that hold skin cells together Vesicles-> exudate More common in <2s and neonates Systemic symptoms If severe: staphylococcal scalded skin syndrome Swabs of vesicles
46
Treatment of bullous impetigo
Flucloxacillin | Oral/IV
47
Complications of impetigo
``` Cellulitis Sepsis Scarring Post-streptococcal glomerulonephritis Staphylococcal scalded skin syndrome Scarlet fever ```
48
Staphylococcal scalded skin syndrome
Caused by staph aureus which produces epidermolytic toxin (protease) Breaks down proteins that hold skin cells together Usually affects <5 years old Older children and adults usually have immunity
49
Presentation of staphylococcal scalded skin syndrome
Patches of erythema on skin Skin looks thin and wrinkled Formation of fluid filled blisters called bullae, which burst and leave sore, erythematous skin below Similar appearance to burn or scald Nikolysky sign: gentle rubbing of skin causes it to peel away Systemic symptoms: fever, irritability, lethargy, dehydration
50
Management of staphylococcal scalded skin syndrome
Admission and treatment with IV ax Fluid and electrolyte balance as patients are prone to dehydration Children usually make a full recovery without scarring with adequately treated
51
Steven-Johnson syndrome and toxic epidermal necrolysis
``` Disproportional immune response Epidermal necrolysis I Blistering and shedding of top layer of skin SJS <10% surface area affected TEN: >10% surface area affected HLA genetic ```
52
Causes of Steven-Johnson syndrome and toxic epidermal necrolysis
``` Medications: Anti-epileptic Antibiotics Allopurinol NSAIDs ``` ``` Infections: Herpes simplex Mycoplasma pneumoniae CMV HIV ```
53
Presentation of Steven Johnson syndrome
Maculopapular rash with target lesions Develop into vesicles or bullae Mucosal involvement Fever, arthralgia Purple/red rash that spreads and blisters Skin sheds Pain, erythema, blistering and shedding lips and mucous membranes Eyes inflamed and ulcerated Urinary tract, lungs and internal organs involvement
54
Toxic epidermal necrolysis presentation
Systemically unwell, pyrexia, tachycardia Positive Nikolysky sign: epidermal separates with mild lateral pressure Purple/red rash that spreads and blisters Skin sheds Pain, erythema, blistering and shedding lips and mucous membranes Eyes inflamed and ulcerated Urinary tract, lungs and internal organs involvement
55
Management of SJS and TEN
``` Medical emergencies Nutritional Antiseptics Analgesia Ophthalmology input Steroids Immunosuppressants: cyclosporine and cyclophosphamide Immunoglobulins ```
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Complications of SJS TEN
Secondary infection Permanent skin damage Visual complications: scarring and blindness
57
Two types of contact dermatitis
Irritant contact dermatitis Allergic contact dermatitis Caused by cement
58
Irritant contact dermatitis
Non-allergic Due to weak acids or alkalis Often seen on the hands Erythema is typical, crusting and vesicles are rare
59
Allergic contact dermatitis
TY4 hypersensitivity reaction Often seen on head following hair dyes Presents as acute weeping eczema which predominantly affects the margins of the hairline Topical treatment with potent steroids
60
Viral exanthem
``` Eruptive widespread rash First disease: measles Second disease: scarlet fever Third disease: rubella Fourth disease: Duke’s disease Fifth disease: parvovirus B19 Sixth disease: roseola infantum ```
61
Measles exposure
Symptoms start 10-12days after exposure Respiratory droplet spread Measles virus Face rash 3-5days after fever
62
Measles features
Fever, coryzal symptoms, conjunctivitis Koplik spots 2 days after fever Rash behind ears ten to rest of body, erythematous macular rash with flat lesions
63
Measles management
Self resolving after 7-10days Isolate children until 4 days after symptoms have resolved Notifiable disease
64
Complications of measles
``` Pneumonia Diarrhoea Dehydration Encephalitis Meningitis Hearing loss Vision loss Death ```
65
Scarlet fever transmission and cause
Cause: Group A streptococcus (tonsilitis) | Step pyogenes exotoxin
66
Scarlet fever features
``` Red-pink blotchy macular rash Sandpaper skin that starts on trunk and spreads outwards Red, flushed cheeks Fever Lethargy Flushed face Sore throat Strawberry tongue Cervical lymphadenopathy ```
67
Scarlet fever management
Phenoxymethylpenicillin (Penicillin V) 10 days Notifiable disease Keep children off school until 24hours of antibiotics
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Conditions associated with group A strep infections
Scarlet fever Post-streptococcal glomerulonephritis Acute rheumatic fever
69
Rubella transmission
Rubella virus Highly contagious Spread by resp droplets Symptoms start 2 weeks after exposure
70
Rubella features
Symptoms start 2 weeks after exposure Milder erythematous macular rash compared with measles Rash starts on face and spreads to rest of body Lasts 3 days Mild fever, joint pain, sore throat Lymphadenopathy behind ears and back of neck
71
Rubella management
Supportive and self-limiting Notifiable disease Children stay off school for 5 days after rash appears Children should avoid pregnant women
72
Complications of rubella
Thrombocytopenia Encephalitis Dangerous in pregnancy-> congenital rubella syndrome (deafness, blindness, congenital heart disease)
73
Dukes disease
Non-specific viral rashes
74
Parvovirus B19
Fifth disease, slapped cheek syndrome, erythema infectiosum
75
Symptoms of parvovirus B19
Mild fever, coryza, non-specific viral symptoms (muscle aches and lethargy) After 2-5 days rash appears rapidly, diffuse bright red rash on both cheeks Reticular (net-like) mildly erythematous rash affecting trunk and limbs, raised and itchy
76
Management of parvovirus B19
Self-limiting Symptoms fade over 1-2weeks Supportive management, fluids, simple analgesia Infectious prior to rash forming, once rash formed no longer infectious
77
Patients at risk of complications of parvovirus infection
``` Immunocompromised patients Pregnant women Sickle cell anaemia Thalassaemia Hereditary spherocytosis Haemolytic anaemia ``` These patients need serology testing to confirm diagnosis Check FBC, reticulocyte count for aplastic anaemia
78
Complications of parvovirus infection
Aplastic anaemia Encephalitis or meningits Pregnancy complications including fetal death Rarely hepatitis, myocarditis, nephritis
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Roseola infantum
Sixth disease Human herpesvirus6 Human herpesvirus7
80
Roseola infantum presentation
Typical pattern of illness Presents 1-2weeks after infection with a high fever (up to 40degrees), lasts 3-5 days then disappears suddenly Coryzal symptoms, sore throat, swollen lymph nodes during the illness Fever settles and rash appears for 1-2days Mild erythematous macular rash across the arms, legs, trunk and face is not itchy
81
Management of roseola infantum
Children make full recovery within a week and don’t generally need to be kept off nursery if they are well enough to attend
82
Complication of roseola infantum
Febrile convulsions: high temperatures | Immunocompromised patients at risk of myocarditis, thrombocytopenia, Guillian-Barre syndrome
83
Erythema multiforme | Causes and associations
Erythematous rash caused by hypersensitivity reaction Causes: viral infections, medications Associations: herpes simplex virus, mycoplasma pneumoniae
84
Erythema multiforme presentation
Widespread, itchy, erythematous rash Target lesions Sore mouth; stomatitis Symptoms come on abruptly over a few days, mild fever, stomatitis, muscle and joint aches, headaches, general flu-like symptoms
85
Erythema multiforme management
``` Diagnosis based on appearance of rash Identify underlying cause CXR for mycoplasma pneumoniae Self resolves 1-4qeeks Severe: IV fluids, analgesia ```
86
Pathophysiology of urticaria
Caused by release of histamine and mast cells Allergic reaction in acute urticaria Autoimmune reaction in chronic idiopathic urticaria
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Causes of acute urticaria
Allergies to food, medications or animals Contact with chemicals, latex or stinging nettles Medications Viral infections Insect bites Dermatographism
88
Chronic urticaria types
Chronic idiopathic urticaria Chronic inducible urticaria Autoimmune urticaria
89
Chronic idiopathic urticaria
Recurrent episodes of chronic urticaria without a clear underlying cause or trigger
90
Chronic inducible urticaria
Episodes of chronic urticaria that can be induced by certain triggers Sunlight, temperature changes, exercise, strong emotions, hot or cold weather, pressure (dermatographism)
91
Autoimmune urticaria
Chronic urticaria associated with a chronic autoimmune condition
92
Management of urticaria
Fexofenadine (antihistamine) | Short course of oral steroids for severe flares
93
Management of problematic urticaria
Anti-leukotrienes (montelukast) Omalizumab (IgE) Cyclosporin
94
Chickenpox presentation
Widespread, erythematous, raised, vesicular (fluid-filled) blistering lesions Rash starts on trunk/face and spreads outwards Whole body by day 2-5 Scab over and stop being contagious Fever Itch Malaise and fatigue
95
Chickenpox infectivity
Highly contagious Infected droplets from a cough or sneeze Patients become symptomatic 10days to 3weeks after exposure Stop bring infectious once lesions have crusted over
96
Chickenpox complications
``` Bacterial superinfection Dehydration Conjunctival lesion Pneumonia Encephalitis (ataxia) Shingles ```
97
Antenatal and neonatal chickenpox
If not immune, give pregnant women varicella zoster immunoglobulin In pregnancy, congenital varicella syndrome in baby if <28weeks gestation Infection around delivery time: management with varicella zoster immunoglobulins and aciclovir
98
Management of chickenpox
Aciclovir: in immunocompromised, >14 presenting in <24hours, neonates, those at risk of complications Encephalitis: need admission Itching: calamine lotion and chlorphenamine (antihistamine) Off school and avoid pregnant women until lesions have crusted over, 5 days after rash first appears
99
Hand foot and mouth disease presentation
Coxsackie A virus 3-5 days incubation URT symptoms: tiredness, sore throat, dry cough, raised temperature Small mouth ulcers after 1-2 days Then blistering red spots around body, hands feet mouth (painful)
100
Management hand foot mouth disease
Supportive Resolves 7-10days Avoid sharing towels and bedding, washing hands and careful handling of dirty nappies
101
Complications of hand, foot and mouth disease
Dehydration Bacterial superinfection Encephalitis
102
Molluscum contagiosum features
Small, flesh coloured papules Central dimple Crops of multiple lesions in an area Spread through contact, sharing bedsheets
103
Molluscum contagiousum management
Resolves spontaneously Can take up to 18months to resolve Once resolved skin returns to normal Avoid scratching or picking at lesions
104
Management molluscum contagiousum
Avoid sharing towels or close contact with lesions If bacterial superinfection: superficial fusidic acid or oral flucloxacillin Immunocompromised patients: specialist referral, topical potassium hydroxide, benzoyl peroxide, podophyllotoxin, imiquimod, retinoin. Surgical removal and cryotherapy
105
Pityriasis rosea presentation
Prodromal symptoms prior to rash developing Headache, tiredness, loss of appetite, flu-like symptoms Herald patch (faint red, scaly, oval) >2cm diameter on torso 2days later rest of rash appears Christmas tree rash on torso Lesions grey or lighter if darker skin Itch, pyrexia, headache, lethargy
106
Pityriasis rosea disease course
Rash resolves without treatment within 3 months | Skin discolouration resovled in another few months
107
Pityriasis rosea disease course
Patient education and reassurance Not contagious, can resume normal activities Symptomatic treatment if bothered by itching Emollients, topical steroids, sedating antihistamines at night to help sleep
108
Scabies
Sarcoptes scabiei mites burrow under skin and cause infection and intense itching Lay eggs in skin, further infection and symptoms 8 weeks for symptoms/rash to appear after initial infection
109
Scabies presentation
Itchy small red spots Track marks where mites have burrowed Location of rash is between finger webs, can spread to whole body
110
Scabies management
``` Permethrin cream If difficult to treat: oral ivermectin Treat household contacts Hot wash Itching 4 weeks after infecton resolved, crotamitron cream, chlorphenamine at night ```
111
Crusted scabies
``` Norwegian scabies Infection in immunocompromised patients Scaly plaques No itch Oral ivermectin and admission/isolation ```
112
Head lice
Pediculus humanus capitis parasites Cause infestations of scalp Itchy sca,lp
113
Head lice management
Dimeticone 4% lotion to hair left overnight then washed off, 7 day Bug buster kit, special combs
114
DD non-blanching rash
``` Meningococcal septicaemia HSP Idiopathic thrombocytopenic purpura Acute leukaemia Haemolytic uraemic syndrome: oliguria, presents in child with recent gastroenteritis Mechanical: strong coughing, SVC obstruction, vomiting, breath holding Viral illness: influenza, enterovirus Traumatic ```
115
Erythema nodosum
Red lumps across shins Inflammation of subcutaneous fat on shins (panniculitis) Hypersensitivity reaction
116
Erythema nodosum hypersensitivity reaction causes
``` Streptococcal throat infections Gastroenteritis Mycoplasma pneumoniae Tuberculosis Pregnancy COCP ```
117
Erythema nodosum chronci disease associations
IBD Sarcoidosis Lymphoma Leukaemia
118
Erythema nodosum investigations
Inflammatory markers Throat swab for strep infection CXR: mycoplasma, TB, sarcoidosis, lymphomas Stool microscopy and culture: campylobacter, salmonella Faecal calprotectin for IBD
119
Management of erythema nodosum
Rest and analgesia Conservative management Steroids for inflammation Most cases will fully resolve in 6 weeks
120
Seborrhoeic dermatitis
Inflammatory skin condition that affects the sebaceous glands Scalp, nasolabial folds and eyebrows Causes erythema, dermatitis and dry crusted skin Cradle cap Malassezia yeast
121
Infantile seborrheic dermatitis
Cradle cap, crusted flaky scalp Self-limiting condition and resolves by 4 months of age, can last until 12 months First line: oil, brush scalp, white petroleum jelly overnight, Second line: antifungal clotrimazole, miconazole for up to 4 weeks
122
Seborrheic dermatitis of the scalp
Dandruff Dense oily scaly brown crusting More common in adolescents and adults First line: ketoconazole shampoo, topical steroids if severe itching
123
Seborrheic dermatitis of face and body
Red, flaky, crusted, itchy skin Commonly affects eyelids, nasolabial folds, ears, upper chest, back First line treatment: clotrimazole or miconazole antifungal cream, hydrocortisone 1% for localised inflamed areas
124
Tinea capitis
Ringworms affecting scalp | More common in children
125
Tinea pedis
Ringworm affected feet Athletes foot White or red, flaky, cracked, itchy patches between the toes Skin may split and bleed
126
Tinea cruris
Ringworm of groin
127
Tinea corporis
Ringworm on body
128
Onychomycosis
Fungal nail infection | Thickened, discoloured and deformed nails
129
Name of fungus causing ringworm
Trichophyton
130
Ringworm presentation
Itchy rash | Erythematous, scaly, well demarcated
131
Management of ringworm
Clotrimazole and miconazole antifungal creams Ketoconazole shampoo for tinea capitis Oral antifungal: fluclonazole, griseofulvin, itraconazole Fungal nail infections: amorolfine nail lacquer for 6-12months, oral terbinafine after checking LFTs Daktacort: hydrocortisone 1% and miconazole 2%
132
Ringworm advice
Wear loose breathable clothing Keep affected areas clean and dry Avoid sharing towels, clothes or bedding Use a separate towel for feet with tinea pedis Avoid scratching and spreading to other areas Wear clean dry socks every day
133
Tinea incognito
Fungal skin infection that results from the use of steroids to treat an initial fungal infction Steroids slow down immune response, allowing fungus to grow Less dermarcated border and less scales
134
Nappy rash
``` Contact dermatitis Friction between skin and nappy Contact with urine and faeces Common 9-12months of age Added fungal (candida), bacteria (staph/strep) infection ```
135
Risk factors for nappy rash
Delayed changing of nappies Irritant soap products and vigorous cleaning Poorly absorbent nappies Diarrhoea Oral antibiotics predispose to candida infection Pre-term infants
136
Nappy rash presentation
Sore, red, inflamed skin in nappy area Skin creases spared Red papules Erosions and ulceration eventually
137
More likely candida than nappy rash
``` Rash extending into skin folds Larger red macules Well-dermarcated scaly border Circular pattern to the rash spreading outwards, similar to ringworm Satellite lesions Oral thrush ```
138
Management of nappy rash
Switch to highly absorbent nappies Change nappy and clean skin as soon as possible Use water or gentle products Ensure nappy area is dry before replacing nappy Maximise time not wearing nappy
139
Complications of nappy rash
Candida infection: clotrimazole cream or miconazole Cellulitis Jacquet’s erosive diaper dermatitis Perianal pseudoverrucous papules and nodules