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Facial erythema after allogeneic stem cell transplantation (SCT) is most commonly caused by acute graft-versus-host disease (aGVHD), although viral exanthema, drug reactions, and chemotherapy toxicity are also on the differential.1 Immunosuppressed patients have higher rates of more severe infestations with Demodex folliculorum, and there are few reports of demodicidosis presenting as facial erythema after SCT.2-5 We report 2 cases of Demodex folliculitis presenting as erythematous papules on the face resembling aGVHD but with a distinctive cutoff sign at the scalp that may serve as an important diagnostic tool in differentiating demodicidosis from the other etiologies of facial erythema.
Chen et al. (Thu,) studied this question.