Dermoscopic images of the parallel furrow pattern and its variants in acquired melanocytic nevi of palms and soles

In the parallel furrow pattern, parallel, pigmented lines are detected along the furrows of the skin markings. The basic type of this pattern is a single solid line of pigmentation along the furrow (A). Variants include a double solid line variant (B), a single dotted line variant (C), and a double dotted line variant (D).