Flashcards in Dermatology Deck (37):
what is acne?
disorder of the pilosebaceous apparatus
peaks in adolescence
what causes acne?
excess sebum secretion
obstructuion of pilosebaceous duct
how to treat acne?
topical vitamin a analogues
what is rosecea?
affects face of adults
flushing erythema/telangectasia, inflammed papules, pustules
may be associated with conjunctivitis
what might rosecea be triggered by?
how to treat rosacea?
avoid triggering factors
antibiotics - topical +/- systemic
what should you avoid treating a rosacea pt with?
what is impetigo?
caused by staph or strep
exudate and yellow crusting
tx - antibiotics
what may impetigo trigger?
what is folliculitis?
superficial infection of hair follicle
papules/pustules + 1-2mm of erythema
what is a furuncle?
boil/small perifollicular abscess - follicle destroyed
what is a stye?
a furuncle affecting the sebaceous gland of the eye margin
what is a carbuncle?
a 3-10cm nodule
what is erysipelas?
form of cellulitis
group a beta haemolytic strep
spreading red edge,sharp line of demarcation
tx with systemic antibiotic
what are viral warts caused by?
how to warts resolve?
on their own
what is molluscum contagiosum?
DNA pox virus
may become secondary infected
what is hand foot and mouth caused by?
coxsakie A virus
vesicles with red halos @ hands/feet, erosions in mouth
resolves in 2 weeks
what is dermatophyte?
cause ringworm/tinea at various body sites
itchy, erythematous scaly plaque with peripheral spread or boggy pustular area with hair loss
may be masked with use of topical steroids
woods lamp exam
topical plus/minus systemic antifungals
what is acute eczema?
red swollen papules/vesicles
what is chronic eczema?
scaly pigmented thickened accentuated skin markings
what two forms may eczema be?
endogenous - atopic/varicose eczema
exogenous - allergic contact/dermatitis etc
how is eczema treated?
may be come superinfected
avoid irritants, moisturise, steroids, UVL
how is patch testing done?
allergens applied to finn chambers - applied to back for 24 hours
what is psoirasis?
chronic non inflammatory disease
well demarcated scaly plaques
different clinical patterns
where does psoriasis commonly affect?
nails - pitting/subungal hyperkeratosis
tar, dithranol,vit D creams, phototherapy, systemic immunosuppresants
what is lichen planus?
icthy violaceous flat topped pustules on wrists and legs
50% have oral involvement
may be genital involvement
rare ulcerative mucosal form may lead to malignancy
what is bullous pemphigoid?
large tense blisters on erythematous base
mouth rarely affected
IgG antibodies bind to basement membrane
what is cicatrical pemphigoid?
blisters/ulcers affecting mucous membranes
lesions heal with scarring
1/3 pt's have skin involvement
steroids plus/minus immunosuppresants
what is pemphigus vulgaris?
life threatning autoimmune disease
IgG antibodies bind to intercellular cement. Flacid blisters/erosions
oral lesions pathognomonic
- high dose steroids/immunosuppressives
what is erythema multiforme?
variety of triggers - herpes simplex/other infections, drugs, cancers, radiotherapy, CT disease
what lesions are seen in erythema multiforme?
-lesion - limbs/palms/sores
bullae may form
usually self limiting
- Steven Johnsosn syndrome - acute onset with severe mucosal involvement, systemic disturbance, risk of renal failure and bronchopneumonia
actinic keratoses and bowens disease are more common in what patients?
high risk if pt immunosuppressed
what is actinic keratoses?
hyperkeratotic lesions on sun exposed skin
can progress to squamous cell cancer - not common