Case history
Case history #1
A 14-year-old boy presents with scaly nonpruritic erythematous papules that vary in size from 3 mm to 1 cm on the trunk and extremities. This eruption has been present for about 2 months and there were no signs or symptoms of internal organ involvement. Review of symptoms, medical, plus family and social histories are noncontributory.
Case history #2
A 3-year-old girl presents with a 1-week history of nonpruritic, nontender polymorphic eruption on the trunk and extremities, with few facial lesions. Her mother reports that this is the third episode over the past 3 years. The review of symptoms is positive only for mild malaise at the onset of the rash. Her medical, family and social histories are noncontributory.
Other presentations
A continuum of pityriasis lichenoides encompasses pityriasis lichenoides et varioliformis acuta, pityriasis lichenoides chronica and febrile ulceronecrotic Mucha-Habermann disease. The febrile ulceronecrotic Mucha-Habermann disease variant should be treated as a dermatological emergency.
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