Guttate psoriasis — RACP Paediatrics MCQ

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ModerateRheumatology and dermatologyGuttate psoriasisRACP Paediatrics

An 8-year-old develops multiple small scaly erythematous plaques over the trunk two weeks after a sore throat. The lesions are drop-like and mildly itchy; there is no mucosal involvement. What is the most likely diagnosis?

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Correct answer: B — Guttate psoriasis

A sudden eruption of drop-like scaly plaques after streptococcal pharyngitis is typical of guttate psoriasis. Pityriasis rosea usually has a herald patch and Christmas-tree distribution rather than a post-streptococcal drop-like eruption. The pearl is to examine for psoriasis features and consider throat assessment when guttate psoriasis follows pharyngitis.

Reference: RCH Clinical Practice Guidelines; Therapeutic Guidelines (eTG): Dermatology