Dermatology Flashcards
Compare basal cell and squamous cell carcinoma
Squamous cell: Papule then nodule sized ulcer
BCC: Pearly rolled edge, telangectasia, necrotic or ulcerated centre
Compare acne vulgaris and rosacea in terms of
Age
Common sites
Lesion features
Vulgaris // Rosacea
Young adults // 30-60 years
Face, chest, back // central face
Comedones, inflammed lesions // lumpy red skin, telangectasia
What is the initial treatment course for acne vulgaris
12 weeks of the following regimes
Mild-moderate
A + B: Adapelene + Benzoyl peroxide
B + C: Benzoyl + clindamycin
C+ T: Clindamycin + Tretinoin
Mod-severe
A+B
C+T
A+B + doxy/tetracycline
Azelaic acid + lymecycline
Outline the step-up and referral criteria for acne vulgaris management?
1st line fails: try another regime, add antibiotics
Refer: If abx fails, uncertainty or extenive nodules
Regarding ABx therapy in acne vulgaris what
Is given instead of doxycline/tetracyclines contraindicated
Can be given to menstruating women instead of ABx
Trimethoprim or oral macrolide
COC pill
Whats the treatment for acne rosacea
1st: topical metroniazole (tetracycline)
How do you differentiate the following psoriasis
Plaque
Inverse
Guttate
What is the treatment for psoriasis
- topical steroid + vitamin D analogue at different time
- Stop steroid, 2 x vit D
- Stop vit D, 2 x steroid
+ dithranol/coal tar
Whats this?
How do you manage it
Lichen planus
Skin biopsy
Corticosteroids
Whats this?
Wickham’s striae
Seen in Lichen planus
How do you differentiate sebhorreic keratosis with malignant melanoma?
Sebhorreic // melanoma
Multiple, asymptomatic // evolving, itching, bleeding
Variable sites // legs in women, trunk in men
Warty, greasy appearance // ABCDE features
Nothing // Excise
Differentiate vulgaris, pemphigoid and herpetiformis based on…
Pain and itch
Tension
Immune findings
Treatment
vulgaris // pemphigoid // herpetiformis
pain // itch // very itchy
Flaccid // tense // tense
IgG, chicken wiring // IgG, C3, dermo-epidermal junction lights up // IgA and IgG, granular pattern, villous atrophy
Steroids + immuno // Steroids, antibiotics, immuno // gluten exclusion, dapsone
What is the treatment for scabies?
Permethrin
Malathion
Target lesions following drugs or infection indicates what?
Erythema multiforme
What is the Koebner phenomenon and what does it occur in?
Trauma causes dermatomal line, happens in
psoriasis
vitiligo
warts
lichen planus
lichen sclerosus
molluscum contagiosum
