Melanoma of the nail is a malignant tumor of high malignancy, which usually comes from the malignant transformation of the original nevus in the early stage, manifested in a kind of streaky nevus or spotted nevus that starts to deepen and darken, and some even show a very rapid growth. The early symptoms are mainly manifested in the deepening of the color, scope and depth of the nevus, and there is no pain or performance that affects the activities, and the main performance is the deepening change and acceleration of the shape and color.