January 2013

Pagetoid Dyskeratosis With Parallel Ridge Pattern Under Dermoscopy

Author Affiliations

Author Affiliations: Department of Dermatology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.

JAMA Dermatol. 2013;149(1):109-111. doi:10.1001/archdermatol.2012.3201

A parallel ridge pattern under dermoscopy is a prominent dermoscopic finding in macules of malignant melanoma on the palms and soles. Herein, we present a case of pagetoid dyskeratosis with a parallel ridge pattern under dermoscopy.

A 34-year-old Japanese woman was seen with a 1-year history of brownish pigmentation on her left small finger, which had expanded and intensified in color during the previous 2 weeks (Figure 1A). She was an office worker and a nonsmoker. There was no history of contact with chemical substances or dyes.

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