Melanoma is not easy to contract, with relatively low incidence and mortality rates. Melanoma is a tumor derived from the malignant transformation of melanocytes, highly malignant, often occurring in the skin but also in mucous membranes, the choroid of the eye, the pia mater, and other various parts and tissues. In the Chinese population, it commonly appears on the extremities of the skin, such as the sole of the foot, toes, fingertips, and under the nails. According to global cancer statistics from last year, melanoma accounts for 1.6% of all new cancer cases. In China, the incidence and mortality rates of cutaneous melanoma are relatively low, with about one case per 300,000 people. In recent years, there has been a rapid increase in the incidence of melanoma, which needs to be monitored carefully.