What Causes Black Discoloration of the Nails?
Disease description:
My fingernails have appeared slightly blackened over the past two days. It seems the discoloration originates from within the nail plate itself—not just on the surface—and is not yet severe. Could you please explain what might cause nail blackening?
Doctor's answer (2)
Dr. Li Ruizhi
Hello, common causes of blackened nails include trauma (e.g., external pressure or injury), onychomycosis (fungal nail infection), nail dystrophy, peripheral vascular disease, diabetes mellitus, and psoriasis—all of which may predispose individuals to onychomycosis. Additionally, prolonged poor hygiene habits can also contribute. I hope this information is helpful. Wishing you good health!
