Pityriasis lichenoides represents a distinct subset of inflammatory skin disorders that includes pityriasis lichenoides chronica, febrile ulceronecrotic Mucha-Habermann disease, and pityriasis lichenoides et varioliformis acuta (PLEVA). PLEVA typically manifests as an acute to subacute skin eruption of several tiny red papules that grow into polymorphic lesions. It may also leave behind varicella-like scars and hyper- or hypopigmentation sequelae. Pityriasis lichenoides chronica (PLC) has very small reddish-brown flat maculopapules with a mica-like scale that appear more gradually; it also has long remission intervals between episodes of relapse. Febrile ulceronecrotic Mucha-Habermann disease (FUMHD) is best treated as a dermatological emergency because it is an acute, severe, widespread eruption of purpuric and ulceronecrotic plaques that can have a 25% fatality rate and accompanying systemic involvement..