There are several common reasons for patients to have black spots on their legs: First, melanoma on the skin of the legs can be manifested as black spot-like changes, and melanoma is a tumor with a high degree of malignancy, so patients are recommended to have surgery to remove it as soon as possible. After surgery, it can be combined with local radiotherapy treatment, and patients with early disease can achieve certain therapeutic effects. Second, after the patient’s leg injury, due to the local scar tissue proliferation can appear local black spots, then you can use hot amoxicillin pack external application, blood circulation and stasis cream external application, oral medicine such as Maizi Ling, improve the blood circulation of black spots, promote scar softening, so as to reduce the symptoms of black spots. Thirdly, patients with varicose veins in lower limbs can have local skin pigmentation and black spots because of the tortuous and dilated superficial blood vessels. In this case, patients can be treated surgically to remove the varicose blood vessels to reduce skin pigmentation and improve the symptoms of dark spots.