16-year-old boys often lose hair can be physiological hair loss, without special treatment, if caused by seborrheic alopecia, baldness and so on can use the appropriate drugs to treat. 1. Physiological alopecia: under normal circumstances, the number of hair loss per day within 100 is normal, no need to worry, usually can pay attention to scalp hygiene, pay attention to nutritional intake. 2. Seborrheic alopecia: Seborrheic alopecia is often caused by excessive secretion of androgens, which can be treated with topical minoxidil and, if necessary, oral finasteride and other drugs. 3. Patchy baldness: Patchy baldness can be caused by mental factors, usually should pay attention to maintain a relaxed mood, you can use glucocorticoids such as dinexed cream local smear, or local lesions within the injection of trimethoprim and other drugs. If the phenomenon is serious, you should go to the hospital in time for examination, and the use of the above drugs should follow the doctor’s instructions.