This 25-year-old presented two weeks ago with a single round, scaly lesion, diagnosed as fungal. The rash is on the trunk, the upper arms and the thighs. What is this condition?

Mum is concerned about this rash, which has been there for a week. The baby is three weeks old and otherwise well. What could this be?

Pityriasis rosea Guttate psoriasis Discoid eczema Lichen planus

Eczema Psoriasis Erythema toxicum neonatorum Measles

A parent has brought this seven-year-old to see you. He had a sore throat two days ago and the rash came up yesterday, first in the mouth. What is the likely diagnosis?

Eczema Measles Hand foot and mouth disease Lichen planus

You are asked to see a 10-year-old girl with these marks on her legs. What is this condition?

Non-accidental injury Lichen striatus Stretch marks Eczema

Answers 1 Pityriasis rosea This presents with a‘ herald patch’, often misdiagnosed as tinea, followed five to 15 days later by multiple, flat, scaly lesions on the trunk and limbs. Management is symptomatic and it should resolve in six weeks. 2 Erythema toxicum neonatorum This is seen in newborns, from a few days up to two weeks old. The rash can spread to the trunk and limbs. It is a clinical diagnosis and needs no treatment. 3 Hand foot and mouth disease This presents with symptoms of a cold followed by a rash in the mouth and then on the feet and the hands. It usually resolves without treatment within seven to 10 days. 4 Lichen striatus This is a rare, selflimiting condition presenting with spots that join to form a band-like appearance. It most commonly occurs in girls aged five to 15 years. No treatment is needed.

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