Most black birthmarks can be completely removed at an early stage or when the area is small; if the area is large, the patient may have some of the birthmarks left behind or scarring. Most black birthmarks can be completely removed when treated at an early stage or when they are small in scope. Patients can go to the dermatology, plastic surgery or general surgery department of regular hospitals for consultation and choose more suitable treatment methods under the guidance of doctors, such as laser, microwave, liquid nitrogen freezing or surgery, etc., and take split treatment to achieve the purpose of cure. If the patient has a large black birthmark, it may produce residual birthmark when treated by laser. In addition, if the patient is to remove the black birthmark through surgical excision method, the patient will generally be left with scar after surgery because the surgical excision method is more traumatic. If a patient’s black birthmark is located in a location prone to friction, such as the neck, the back of the hand or the bottom of the foot, it is recommended that it be removed in a timely manner, because long-term friction can easily lead to malignant changes.