Dermatology Flashcards
Most common malignancy associated with acanthosis nigricans?
Gastric adenocarcinoma
Painful skin ulceration associated with IBS, RA, SLE, and haematological disorders?
Pyoderma gangrenosum
Acne vulgaris in pregnancy if treatment needed?
Erythromycin
Most common type of melanoma that has the typical diagnostic features of a changing mole:
Superficial spreading melanoma. Occurs at sites of intermittent intense sun exposure.
4 diagnostic criteria of Hereditary Haemorrhagic Telangiectasia (Osler-Weber-Rendu):
- Epistaxis
- Telangiectases (lips, oral cavity, fingers, nose)
- Visceral lesions: gastrointestinal telangiectasia, pulmonary, hepatic, cerebral, spinal AVMs
- Family history: a first-degree relative with HHT
Psoriasis exacerbating drugs:
Beta blockers, lithium, antimalarials, NSAIDs and ACE inhibitors, infliximab.
What may cause guttate psoriasis and what is the treatment?
Streptococcal infection 2-4 weeks before onset. Reassurance + topical treatment if symptomatic.
Impetigo treatment, 1st and 2nd line:
Hydrogen peroxide 1%, 2nd fusidic acid.
Lichen planus treatment:
Topical clobetasone butyrate (potent steroids).
Scaly lesions that develop after chronic sun exposure and are premalignant, and treatments:
Actinic keratoses. Topical fluorouracil or diclofenac.
Elder, tense blisters without mucosal involvement?
Bullous pemphigoid
Multiple hypo or hyperpigmented patches, itchy, scaly, more noticeable after suntan, caused by Malassezia:
Pityriasis versicolor
Mild-moderate rosacea treatment:
Topical ivermectin, then oral doxycycline
Child with atopic eczema with sudden worsening, painful blisters/punched out erosions around mouth and neck. Diagnosis and treatment:
Eczema herpeticum, IV aciclovir.
Patient with coeliac disease, itchy vesicular lesions on extensor surfaces, biopsy shows IgA deposition:
Dermatitis herpetiformis
Flexural psoriasis treatment:
Mild-moderate topical corticosteroids for up to 2 weeks.
Shiny painless plaques with telangiectasias on the shins of a middle-aged diabetic woman:
Necrobiosis lipoidica
Old man with a tender, well-demarcated nodular lesion in the ear that has not grown in months:
Chondrodermatitis nodularis helicis
Young female with blisters/vesicles in both hands, intensely itchy and burning with some desquamation, worsen in summer:
Pompholyx (dishidrotic eczema)
Treatment for bullous pemphigoid:
Refer for oral corticosteroids
Investigation for cause of reaction after anaphylaxis from wasp sting?
RAST, when previous anaphylaxis
Patient with longstanding ulcer, develops pain, borders are raised and there’s slough:
Think of Marjolin’s ulcer. Neoplastic changes in chronically inflamed or traumatised lesions or non-healing ulcers.
