Pseudolymphoma due to Hair Dye on Background of Chronic Actinic Dermatitis Responding to Intra-lesional Triamcinolone

Cutaneous pseudolymphoma refers to a heterogenous group of benign T-cell or B-cell lymphoproliferative processes that mimic cutaneous lymphoma clinically and sometimes histologically. The causes of cutaneous pseudolymphoma are diverse, including lymphomatoid drug eruptions, lymphomatoid contact dermatitis, arthropod-bite reactions, chronic actinic dermatitis (CAD). Here we describe a case of pseudolymphoma due to hair dye on background of CAD.

Exogenous ochronosis in a Chinese patient: use of dermoscopy aids early diagnosis and selection of biopsy site

The diagnosis of exogenous ochronosis is often challenging and requires a high index of suspicion. Herein, we report a case of exogenous ochronosis in a Chinese patient. The condition was caused by the use of bleaching agents, including creams containing hydroquinone. We demonstrate the use of dermoscopy as an invaluable tool for the early recognition of the condition, as well as in the selection of an appropriate site for a skin biopsy.