Generally, it is caused by the lack of B vitamins, such as B 1, B2, B3, B6, B 12, nicotinic acid, etc. These are usually found in fresh vegetables, but they are often destroyed due to cooking conditions. So in addition to eating more vegetables, eat more vitamin B tablets. I bought a bottle of Tong Ren Tang, and it feels good. 98 yuan, you can eat for 60 days. In addition, squeeze your lips with vitamin E capsules before going to bed, and the effect is good. But it's useless to use natural and synthetic ones. Yangshengtang will do, if you eat. Generally, the effect can be seen after continuous application for 3 or 4 days. But if it is cured, it is recommended to eat vegetables and vitamin B.