Nail involvement in langerhans cell histiocytosis.

Nail involvement, which is distinctly uncommon in Langerhans cell histiocytosis (LCH), is characterized by various features like longitudinal grooving, purpuric striae, hyperkeratosis, subungual pustules, deformity, loss of nail plate, paronychia, onycholysis, and pitting. Here the authors report the case of a child who presented with isolated nail unit changes due to Langerhans cell histiocytosis before the evolution of systemic features. The authors suggest that LCH should be considered in differential diagnoses of nail changes that are resistant to therapy.