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.
Correspondence: Dr Inokuma, Department of Dermatology, Hokkaido University Graduate School of Medicine, North 15, West 7, Kita-ku, Sapporo 060-8638, Japan (firstname.lastname@example.org).
Conflict of Interest Disclosures: None reported.
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Figure 1. Images of the patient's lesion. A, Clinical examination shows a brownish patch around the tip of the left small finger. B, Dermoscopy shows parallel ridge pattern and fibrillar pattern.
Figure 2. Histopathologic specimens under hematoxylin-eosin stain show pale cells in the epidermis and stratum corneum. A, Original magnification ×200. B, Original magnification ×400.
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