Ulcerative Lesions in the Intertriginous Areas of an Adolescent Female Patient: A Case of Inverse Erosive Lichen Planus.

Lichen planus is a common mucocutaneous disorder that can affect various parts of the body, with its erosive variant typically involving the oral mucosa. This variant rarely affects the skin, and even less commonly, the flexural regions. Here, we present a case of a 14-year-old girl who presented with ulcerated, itchy lesions in the intertriginous areas for one year. Dermoscopic examination showed white, lacy reticular streaks suggestive of Wickham striae. Furthermore, on histopathology, the presence of interface dermatitis confirmed the diagnosis of inverse erosive lichen planus. This case underscores the role of dermoscopy in diagnosing rare erosive dermatoses in flexural regions, especially in pediatric patients. Prompt diagnosis, supported by histopathological and dermoscopic findings, facilitates early initiation of treatment. Our patient was treated with oral corticosteroids, topical clobetasol, and antihistamines, leading to complete resolution of the lesions.