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Correspondence |

Parallel Ridge Pattern Due to Cryotherapy Treatment

Rocío Díaz Moreno, MD; Javier Domínguez-Cruz, MD; Teresa Zulueta, MD; Javier Quintana, MD; Julián Conejo-Mir, PhD
JAMA Dermatol. 2013;149(4):491-493. doi:10.1001/jamadermatol.2013.2346.
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Dermoscopy has clearly improved diagnosis of pigmented skin lesions. By virtue of the special architecture of the epidermis on palms and soles, these locations have specific patterns. Parallel ridge pattern (PRP), a bandlike pigmentation on the ridges of the surface skin markings, is a highly characteristic dermoscopic pattern of acral melanoma. However, it can be detected in a few benign conditions.

Correspondence: Dr Díaz Moreno, Department of Dermatology, Hospitales Universitarios Virgen del Rocio, Avenida Manuel Siurot S/N, 41013 Sevilla, Spain (rociodiaz1986@hotmail.com).

Conflict of Interest Disclosures: None reported.

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Figure 1. Clinical examination revealed an asymmetrical dark brown macule.

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Figure 2. Dermoscopy showed a parallel ridge pattern, and the presence of “pebbles on the ridges” could be identified (arrows).




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