Patch baldness is a non-scarring hair loss disease, can occur at any age, which is mainly common in young adults, the onset of 15 years of age exists, the specific cause is not clear, may be related to immune dysfunction, genetic factors, mental factors. 1. Immune dysfunction: in some cases, the lymphocytes in the human immune system are dysfunctional and cannot distinguish normal cells from those that attack the hair follicles, destroying the normal hair follicle structure, thus leading to baldness and hair loss. 2. Hereditary factors: baldness has a certain genetic basis, if the parents have a history of baldness, their children have a relatively high chance of baldness. 3. Mental factors: Being seriously troubled by chronic diseases, prolonged anxiety, tension or sleep disorders and other neuropsychiatric factors can also lead to immune disorders, thus inducing baldness and hair loss. It is recommended that patients with baldness go to the hospital in time and follow the doctor’s instructions for standardized treatment to avoid aggravation.