Baldness at the age of 20 may be caused by androgenetic alopecia, spot baldness and other factors, which can be improved by medication and surgery. 1. Androgenetic alopecia: the cause of this disease is not known, may be related to androgens, genetics, etc., the clinical manifestation is the persistent reduction of hair in the top part of the head leading to baldness, which is more common in males between the ages of 20 and 30. Patients can follow the doctor’s instructions can be used externally through the minoxidil, male patients oral small doses of finasteride, female patients oral spironolactone and other medications, but also under the guidance of the doctor to take hair transplantation and other surgical methods of treatment. 2. Patch baldness: the cause of this disease is not known, may be related to genetics, immunity, mental and psychological factors, etc., the patient within a short period of time in the scalp appeared round or oval size varying non-scarring hair loss area, serious cases can lead to hair loss of the whole head. Patients can apply minoxidil locally under the guidance of doctors to improve the microenvironment of hair follicle growth and promote hair growth, as well as applying glucocorticoid creams such as halometasone cream locally, and taking oral glucocorticoid medications such as prednisone as prescribed by the doctor in severe cases. Baldness in his 20s may also be the result of previous inflammatory diseases such as ringworm and folliculitis, which destroy the hair follicles and form localized scarring and affect hair regeneration after healing. It is recommended that patients go to the hospital in time to improve the relevant examination to clarify the cause of the disease, under the guidance of the doctor symptomatic treatment, avoid unauthorized use of drugs or treatment.