Lines parallel Ridges

Lines Parallel Ridges

Melanoma

Sub Corneal bleeding

Very rarely Spitz nevus

This is an excellent clue to melanoma with high sensitivity and specificity. The only condition that clouds the issue is sub corneal hemorrhage sometimes known as Talon Noir. The ridges are usually wider than the furrows and have the clear openings of the eccrine ducts in the centre of them. Very rarely a Spitz nevus can present on the sole of the foot with a parallel ridge pattern. The lesion is usually small <6mms If larger more likely melanoma.