A 23-year-old Chinese woman presented with thick, asymptomatic, dark brown adherent crusts on her face of 2 years' duration. The patient had no significant medical or dermatologic history. She was very nervous and upset at her facial lesions. Heavy emollients were used without improvement. Afterwards, she developed phobic anxiety and avoided facial cleaning and outdoor activity. The lesions began as dark yellow papules on nasolabial folds and involved the whole face over an 8-month period. One month prior to visiting our clinic, a single transverse white band developed on all of her fingernails.
Shan S, Xu T, Liu J, Lin J, Yin S, Hong Y, Wei H, Guo Y, Fu Z, Chen H. Cutaneous Dirt-Adherent Disease With Single Apparent Transverse Leukonychia on the Fingernails. Arch Dermatol. 2009;145(9):1070-1071. doi:10.1001/archdermatol.2009.208