DCM117

DCM117

Parallel pattern is exclusively found in melanocytic lesions on palms and soles due to particular anatomic structures inherent to these regions. 

Parallel furrow pattern represents the most common dermoscopic pattern in acral melanocytic naevi. The parallel lines tend to be thin and homogeneous in benign lesions, and the pigment is found in the sulcus superficialis, following the skin furrows. 

Parallel ridge pattern is the dermoscopic hallmark of acral malignant melanomas. The parallel lines tend to be thick and heterogenous, being the pigment found in the crest; the openings of the eccrine ducts can often be seen in the centre of the pigmented lines.