Dermatitis Neglecta: A Case Report of Hyperpigmentation Resulting From Impaired Mechanical Cleansing

Dermatitis neglecta (DN) results from inadequate frictional cleansing and is often associated with psychiatric or neurologic impairments. It is frequently misdiagnosed owing to its rarity and variable presentation. We report a 71-year-old woman with extensive hyperpigmented plaques from the mid-back to posterior thighs. Initially suspected to be tinea corporis, the primary lesion did not fluoresce on Wood's lamp examination. Mechanical cleansing with soap, water, and alcohol swabbing removed the pigmentation, confirming DN. This case emphasizes the importance of recognizing DN, particularly in patients with functional limitations, to avoid unnecessary testing and ensure effective management.