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Erythema Nodosum — RACP Adult Medicine MCQ

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EasyGeneral Internal MedicineErythema NodosumRACP Adult Medicine

A 48-year-old woman with type 2 diabetes presents with a 3-month history of lower leg rash. Examination reveals tender, raised, erythematous nodules on the anterior shins that have evolved to leave bruise-like discolouration. What is the most likely diagnosis?

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Correct answer: E — Erythema nodosum

Erythema nodosum presents as tender, erythematous nodules on the anterior shins that evolve through bruise-like colour changes over 2–6 weeks. It is a septal panniculitis. Common causes include streptococcal infection, sarcoidosis, IBD, drugs (sulfonamides, OCP), and infections. No specific treatment is needed; management focuses on the underlying cause. NSAIDs and rest provide symptomatic relief.

Reference: eTG – 2025 – Dermatology