Teenagers with white patches on the face may be due to white furfur, vitiligo, florid furfur and other diseases. 1. white furfur: the etiology of this disease is unknown, research has shown that it may be related to Malassezia furfur infection, which can be induced by malnutrition, dry skin, excessive washing and other factors. Commonly in adolescents or children, preferably in the face, upper arms, etc., the local will appear white patches, some patients may be mild itching. 2. Vitiligo: the occurrence of this disease is related to the reduction of melanin production, the specific cause has not been clarified, may be related to heredity, neurochemicals, autoimmune system diseases and other reasons. Often triggered by skin damage, mental stress and other factors, vitiligo can appear in any part of the body, so some patients will have white patches on the face. 3. florid chaff rash: the pathogen of the disease is malassezia, may also be related to heredity, high temperature and humid environment, malnutrition, immune system inhibitors and other factors. General lesions often appear in the chest, neck, shoulders and other places, if the teenagers living in tropical areas, their face, scalp will also be involved, can be manifested as localized white or yellowish plaques, can be accompanied by mild itching. When teenagers have white patches on the face, they need to go to the hospital in time to clarify the cause of the disease, so as not to delay the condition.