Melanonychia Meaning, Definition, Symptoms, Causes, Treatment
The term "melanonychia" comes from the Greek words "Melas," meaning "black" or "brown," and "Onyx," meaning "nail." It causes the nail plate to turn brownish-black, and the pigment that is usually meant is melanin. Lack of melanin, which pigments skin, makes nails semitransparent. Melanin is helpful in many ways, but it also contributes to melanonychia when it discolors...