Discoloration, darke spots or splinter looking things under the fingernails or toenails.

Bacterial causes

gram negative bacteria like proteus klebsiella or pseudomonas. Can also be yeast like trichophyton or candida [1]

Nutritional causes

Vitamin A retinoids might cause certain bacterial overgrowth that cause this. Garlic seems to help with side effects from vitamin A.

Deficiency of folic acid or cobalamin(B12) might cause it.

Other pages that link to Melanonychia:

Attachments to Melanonychia:

Password to edit: nature