CASE REPORTS
JOURNAL ARTICLE
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Self-healing congenital Langerhans cell histiocytosis presenting as neonatal papulovesicular eruption.

BACKGROUND: Congenital self-healing Langerhans cell histiocytosis (CSHLCH) is a rare condition which may present at birth or during the neonatal period. It is usually characterized by the eruption of multiple, disseminated, red-brown papules and nodules which may increase in size and number during the first few weeks of life. Systemic signs are usually absent except for occasional mild hepatomegaly.

OBJECTIVE: We present a 3.5-kg male infant who presented at birth with numerous diffuse, erythematous, crusted erosions. He was presumed to have congenital herpes simplex virus (HSV) and was started on IV acyclovir. Histopathologic examination revealed a mixed inflammatory infiltrate with numerous histiocytes which were S-100 and peanut agglutin positive consistent with CSHLCH. Further workup did not reveal any signs of systemic involvement.

CONCLUSION: CSHLCH has rarely been reported to present as a papulovesicular eruption at birth. In these cases, a viral etiology is commonly entertained in the differential diagnosis. Despite the spontaneous regression of skin lesions in CSHLCH, close followup is required to evaluate for systemic signs and symptoms associated with latent Letterer-Siwe disease.

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