Koilonychia (spoon-shaped nails) is classically associated with: A) Psoriasis B) Iron deficiency anemia C) Fungal infection D) Lichen planus

A child has intensely pruritic vesicles on the flexural aspects of elbows and knees, with personal/family history of asthma and hay fever. Most likely diagnosis: A) Contact dermatitis B) Atopic dermatitis C) Scabies D) Dermatitis herpetiformis

A patient on carbamazepine develops fever, facial edema, widespread dusky red macules with target lesions and mucosal erosions. Diagnosis: A) Urticaria B) Erythema multiforme major C) Stevens-Johnson syndrome D) Fixed drug eruption

A 40-year-old woman has multiple painful, erythematous nodules on the shins, along with fever and arthralgias after a streptococcal throat infection. Most likely: A) Erythema migrans B) Erythema nodosum C) Erythema multiforme D) Erythema marginatum

Which of the following is a histological hallmark of psoriasis? A) Acantholysis B) Spongiosis C) Munro microabscesses D) Civatte bodies

Tense bullae + linear IgG along basement membrane. Pemphigus vulgaris has flaccid bullae + IgG in intercellular spaces (fishnet pattern).

An elderly farmer has a firm, erythematous nodule on the helix of the ear, with central ulceration and rolled borders. Most likely: A) Actinic keratosis B) Basal cell carcinoma C) Squamous cell carcinoma D) Keratoacanthoma

A Wood’s lamp examination of a scaly scalp lesion shows bright blue-green fluorescence . Likely pathogen: A) Trichophyton tonsurans B) Microsporum canis C) Candida albicans D) Malassezia furfur 4. Answer Key | Q | A | Q | A | Q | A | Q | A | |---|---|---|---|---|---|---|---| | 1 | C | 6 | B | 11 | C | 16 | B | | 2 | B | 7 | A | 12 | C | 17 | B | | 3 | C | 8 | B | 13 | C | 18 | B | | 4 | B | 9 | B | 14 | C | 19 | B | | 5 | B | 10 | C | 15 | B | 20 | B | 5. Detailed Explanations (Selected) Q1. C – Tretinoin Topical retinoids (tretinoin, adapalene) are first-line for comedonal acne because they normalize desquamation. Benzoyl peroxide is better for inflammatory acne.