Nail melanoma develops in a variable location and does not necessarily grow from the root of the nail. Melanoma is a highly malignant tumor of melanocyte origin. Malignant melanoma mostly occurs in the skin, but can also occur in the mucous membranes, the uvea of the eye, and other locations, and in our population it occurs in the skin of the extremities, such as under the fingernails and fingers (toes). The site of nail melanoma is not fixed, characterized by diffuse nail discoloration or longitudinal pigment bands, and does not necessarily grow from the root of the nail. The pigmentation may spread to the nail folds in the proximal or lateral areas. Symptoms such as congestion and pain are also present at the root of the nail. Patients who observe black streaks on their own nails need to visit a hospital promptly, under the guidance of a dermatologist for relevant examinations to clarify the cause of the disease and active treatment.