An Unusual Case of Erythroderma in a 59-Year-Old Male

Pityriasis lichenoides is a rare papulosquamous disorder of unknown aetiology that encompasses a spectrum, ranging from an acute form, pityriasis lichenoides et varioliformis acuta (PLEVA), to a chronic form, termed as pityriasis lichenoides chronica. Erythroderma is characterised by the presence of erythema and scaling that involves a body surface area of at least 90%, which has varying causes, such as psoriasis, drug eruption, and cutaneous lymphoma. We present the case of a 59-year-old male patient in erythroderma with no systemic involvement. A biopsy showed features suggestive of PLEVA, and the patient showed improvement when treated with 8-methoxypsoralen. To the best of our knowledge, pityriasis lichenoides hasn’t been reported as a cause of erythroderma to date.