Dermatology

Question 1

Lupus pernio is pathognomonic of what?

Answer 1

Sarcoidosis

Note: erythematous/violaceous nodules/plaques over nose, cheeks and ears

Question 2

___ is a descriptive term for a skin lesion that is raised and greater than 1 cm in diameter

Answer 2

Plaque

Note: if less than 1cm papule

Question 3

In pemphigus vulgaris, mucous membrane involvement is common, and blisters are usually intact T/F

Answer 3

F - mucus membrane involvement is common but intact blisters are rare

Note:Skin biopsy for routine and direct immunofluorescence is needed to differentiate from bullous pemphigoid

Question 4

Pemphigus or pemphigoid is characterized by shallow ulcers or fragile blisters that break open quickly.

Answer 4

Pemphigus

Note: Pemphigoid presents with stronger or “tense” blisters that don’t open easily.

Question 5

Common causes of EM (erythema multiforme)

Answer 5

Herpes simplex virus infection is the commonest cause

Other common causes
Mycoplasma
Streptococci
Idiopathic
Drug-induced (sulfonamides, sulphonylureas, barbiturates)
systemic diseases (SLE, inflammatory bowel disease, malignancy)

Question 6

Vitaligo is associated with what other pathologies?

Answer 6

Autoimmune thyroiditis
Pernicious anaemia
Alopecia areata
Diabetes mellitus