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Erythema Induratum — SCE Dermatology MCQ

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HardConnective Tissue & VasculitisErythema InduratumSCE Dermatology

A patient has recurrent ulcerating nodules on the posterior calves. Histology shows lobular granulomatous panniculitis with vasculitis; tissue cultures are negative, but testing supports latent tuberculosis. Which diagnostic category best fits?

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Correct answer: B — Tuberculid due to a hypersensitivity response

Erythema induratum of Bazin is classically regarded as a tuberculid: a hypersensitivity reaction in a person with tuberculosis infection elsewhere rather than a skin lesion containing abundant viable bacilli. Active tuberculosis must still be excluded and treatment coordinated with a tuberculosis service.

Reference: https://academic.oup.com/bjd/pages/bad-guidelines