The common reasons for patients to have black spots on legs are as follows: a. Melanoma occurring in the skin of legs can be manifested as black spot-like changes, melanoma is a tumor with high malignancy, and it is suggested that patients should undergo surgical resection as early as possible. After surgery, it can be combined with local radiotherapy treatment, and patients with earlier condition can achieve certain therapeutic effect. Second, after the patient’s leg is injured, due to the local scar tissue proliferation, local black spot can appear, at this time, you can use hot omelet to apply externally, activate blood circulation and eliminate blood stasis cream to apply externally, and take medicines such as Mai Zhi Ling orally, to improve the blood circulation of the black spot and promote the softening of the scar, so as to alleviate the symptom of the black spot. Thirdly, patients with varicose veins of lower limbs may have superficial blood vessel tortuosity and dilatation, resulting in local skin pigmentation and dark spots. At this time, patients can be treated by surgery to strip off the varicose blood vessels to reduce skin pigmentation and improve the symptoms of dark spots.