Spot diagnoses

Question 1

Rapidly progressive painful rash
Monomorphic punched out lesions 1-3mm

Answer 1

Eczema herpeticum

Question 2

Photosensitive rash with blisters and fragile skin across face and dorm of hands

Answer 2

Porphyria cutanaea tarda

Question 3

Itchy papular rash with white lines on surface. White lace pattern mucosa

Answer 3

Lichen planus

Question 4

White itchy patches around genetalia

Answer 4

Lichen sclerosus

Question 5

Tense, itchy blisters at flexures. No mucosal involvement

Answer 5

Pemphigoid

Question 6

Flacid easily ruptured blisters with erythematous painful mucosa

Answer 6

Pemphigus

Question 7

Brown velvety plaques over axilla, neck and groin

Answer 7

Acanthosis nigricans

Question 8

Pearly, flesh coloured papule with telangiectasia

Answer 8

BCC

Question 9

Tender, erythematous lesions over shins

Answer 9

Erythema nodosum

Question 10

Target lesions, starting on dorsal of hands and feet then spreading to torso

Answer 10

Erythema multiforme

Question 11

Flat, scaly pink or brown rash in groin or axilla

Answer 11

Erythrasma

Question 12

Hyperpigmented papule with central depression or dorsal of hands and feet, and extensor surfaces

Answer 12

Granuloma annularae

Question 13

Pink scaly patches on trunk and limbs, tear drop shape. Recent sore throat

Answer 13

Guttate psoriasis

Question 14

Telangiectasia around and in mouth and on fingers. Nosebleeds

Answer 14

Hereditary hemorrhagic telangiectasia

Question 15

Golden crusted lesions around mouth

Answer 15

Impetigo

Question 16

Volcano like appearance. Started at smooth domed papule then develops crater

Answer 16

Keratocanthoma

Question 17

Purple non blanching reticulated rash

Answer 17

Lived reticularis

Question 18

Pearly papule with central umbilication in clusters

Answer 18

Molluscum contagiosum

Question 19

Itchy red patches of different colours

Answer 19

Mycosis fungoides

Question 20

Brown scaly rash on sun exposed sites. Associated diarrhoea and low mood/forgetfulness

Answer 20

Pellagra (nicotinic acid deficiency)

Question 21

Herald patch on trunk, then 1-2 weeks later widespread erythematous oval scaly patches

Answer 21

Pityriasis rosea

Question 22

Hypopigmented or pink patches with scale and mild pruritus. Evident with suntan

Answer 22

Pityriasis vesicolour

Question 23

Very itchy blisters on palms and sores, worst in the heat and humidity

Answer 23

Pompholyx

Question 24

Sudden onset pustule/blister, followed by skin breakdown to painful ulcer. Purple border and deep ulcer. Generally unwell

Answer 24

Pyoderma gangrenosum

Question 25

Linear lines on sides of fingers and interdigital webs. Intense itchy

Answer 25

Scabies

Question 26

Red, crusted lesions around anus and orifices

Answer 26

Zinc deficiency