Notalgia paresthetica with a significant increase in the number of intradermal nerves.

Notalgia paresthetica is an isolated mononeuropathy involving the skin over or near the scapula. The cause remains unknown. We histologically observed a significant increase in the number of dermal nerves in a case of notalgia paresthetica. Immunohistochemical examination using a neural marker, S-100, positively stained the nerves. Interestingly, a biopsy from perilesional skin also showed an abnormal nerve proliferation.