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Solitary Mastocytoma — SCE Dermatology MCQ

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HardPaediatric DermatologySolitary MastocytomaSCE Dermatology

A 4-month-old has a solitary yellow-brown plaque that wheals when rubbed. There is no flushing, syncope, diarrhoea, organomegaly or other lesion. Which plan is most appropriate?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: C — Treat as solitary mastocytoma with trigger avoidance and H1 antihistamine; investigate systemic symptoms

Explanation lettering: B = shown as A · D = shown as B · E = shown as D · A = shown as E

C is correct. A solitary infantile mastocytoma with Darier response and no systemic symptoms is usually a clinical diagnosis with a favourable natural history. Management centres on avoiding friction and other triggers and using an H1 antihistamine for itch or whealing. Extensive lesions, abnormal examination or systemic mediator symptoms warrant broader assessment.

Reference: DermNet: mastocytosis: https://dermnetnz.org/topics/mastocytosis