Whether the hair can grow back after baldness, need to focus on the cause of the disease, if belongs to androgenetic alopecia, spot baldness, etc., usually after regular treatment, the hair can grow back, if it is scarring alopecia, usually the hair can not grow back. 1. Androgenetic alopecia: this disease is a progressive baldness that occurs in adolescence and post-puberty, usually without scarring, treatment, male patients can be treated with oral finasteride; female patients can be treated with oral anti-androgen drugs, such as ethinyl estradiol cyclopropylprogesterone, spironolactone, etc.; can also be used externally to promote the growth of hairs with tincture of minoxidil. After active treatment, the hair can grow back. 2. Patch baldness: this disease is mainly for the sudden onset of limited patchy hair loss, no scar, treatment, can be used externally glucocorticosteroid therapy, such as halometasone, mometasone furoate, etc.; external minoxidil tincture to promote blood circulation, promote hair growth; serious condition, oral glucocorticosteroid therapy, such as betamethasone, trichostatin, etc.. After active treatment, hair can grow back. 3. Scarring alopecia:This disease is mainly caused by developmental defects, infections, tumors, lichen planus, systemic lupus erythematosus and other factors, there is scarring, usually the hair can not grow out again. It is recommended that patients go to the regular hospital dermatology consultation, after a clear diagnosis, reasonable treatment, medication, strictly comply with the doctor’s prescription medication, not blindly self-medication.