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R. Moriuchi, K. Kikuchi, T. Ito, S. Shimizu, Acquired plantar port‐wine stain showing a red parallel ridge pattern under dermoscopy, Clinical and Experimental Dermatology, Volume 39, Issue 8, 1 December 2014, Pages 944–945, https://doi.org/10.1111/ced.12409
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Conflict of interest: the authors declare that they have no conflicts of interest.
The parallel ridge pattern (PRP) observed under dermoscopy is well known as a prominent dermoscopic finding in macules of acral lentiginous melanoma. Its specificity is astonishingly high (99%);1 however, several reports have revealed that PRP can also be seen in benign conditions, such as pigmented naevus, pigmented wart, Laugier–Hunziker–Baran syndrome, anti‐cancer drug‐induced hyperpigmentation, fixed drug eruptions, black heel, pagetoid dyskeratosis and ‘Playstation fingertip’.1,2,3,4 Dermoscopy is a powerful tool for examining vascular neoplasms as well as pigmented lesions. In general, disordered structures including lacunae and accentuated vessels are the most common findings in vascular lesions. We present a case of acquired port‐wine stain with recognizable regular PRP under dermoscopy and characteristic histopathological features.
A healthy 58‐year‐old Japanese man presented with a 1‐year history of a slightly painful, reddish lesion on the sole of his left foot. He had been in the habit of walking more than 10 000 steps each day for years.
