I don't know what you mean when you say that the corners of your mouth often crack. From your description, it is likely that it is chronic cheilitis. The common causes of chronic cheilitis are: 1. Etiology and Pathology of Western Medicine (1) Long-term external stimuli such as dry climate, high-temperature operation, tobacco, alcohol and cosmetics are all related to the onset. (2) Repeated and persistent sunlight exposure, especially in summer, is called actinic cheilitis. Take pictures of vegetables (spinach, rape, etc. ) and drugs containing porphyrin (chlorpromazine, isoniazid). Angelica sinensis and Psoralea corylifolia in traditional Chinese medicine can cause porphyrin metabolism disorder, which is induced by light sensitivity after sunlight exposure. Sensitivity to light may also be related to liver disease, which can cause porphyrin metabolism disorder, while porphyrin is highly sensitive to ultraviolet rays. (3) Bad habits such as lip licking, lip biting, lip trauma and improper treatment of infection. Can form chronic cheilitis. (4) Delayed allergic reaction and infectious focus Delayed allergic reaction is related to infectious focus, such as chronic periapical periodontitis, nasopharyngeal inflammation and other related vasculitis and lymphangitis. 2. Etiology and Pathogenesis of Traditional Chinese Medicine TCM classifies lip wind as the following aspects: (1) Wind-heat attacks spicy and thick taste, turns heat into dryness, accumulates spleen and stomach, re-senses wind-heat, and exogenous factors cause stomach fire, invasion along meridians, stagnation of breath and blood stasis, thus resulting in this disease. (2) Improper damp-heat diet of the spleen and stomach, loss of healthy movement of the spleen, endogenous dampness and turbidity, stagnation of dampness and heat generation, and damp-heat competition lead to this disease. (3) Spleen deficiency with blood dryness, spleen deficiency with loss of transport, no birth of essence and blood, spleen deficiency with blood dryness and lip dystrophy form this disease. (4) Qi stagnation, phlegm coagulation and blood stasis are mostly caused by emotional injury, qi disorder, poor blood circulation, phlegm coagulation and stagnation in the lips, resulting in labial diseases. I suggest you go to a special stomatological hospital for mucosal examination, and the doctor will give you a systematic plan. But the treatment effect of this disease is relatively slow, so you should be patient. See more information about good doctors.