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Chapter 59. Mucha-Habermann Disease

Definition

An inflammatory process in which lesions may erupt (pityriasis lichenoides et varioliformis acuta) and evolve rapidly from erythematous macules and papules to become purpuric papules, papulovesicles that may be hemorrhagic, ulcers, eschars, and, eventually, scars. Alternatively, the macules may evolve more slowly (pityriasis lichenoides chronica) to become scaly papules. In some patients, rapidly developing and slowly evolving lesions may be present concurrently, e.g., purpuric papules and scaly papules may coexist.

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