Hair transplantation is a surgical procedure to take the once lost as well as non-growable hair and solve the related problems such as hair loss and baldness by implanting hair follicles. Most patients can obtain more satisfactory results after hair transplantation. A small number of patients can have the following risks due to improper postoperative care or other reasons: 1. Bleeding: Before this operation, the patient should be evaluated under the doctor’s auxiliary examination for normal bleeding, coagulation function, and the presence of thrombocytopenia, etc.; 2. Infection: If the doctor does not operate properly or the patient’s own condition is poor, infection can occur after the operation, along with malnutrition status such as anemia, hypoproteinemia, and also Diabetes, folliculitis, acne, etc. can occur; 3. Scalp numbness: some patients can have symptoms such as numbness and pain at the back of the head, which may be caused by damage to the superficial sensory nerves during the surgery, generally relieved after 0.5-2 years; 4. Scar: no matter what kind of surgery, there is a possibility of scar formation, and if the patient is a scar body, hair transplant should be avoided. Therefore, it is recommended that before hair transplantation, candidates should choose a professional institution and have this operation performed by an experienced doctor.