The dryness and tightness of the skin around the mouth is considered to be related to physiological factors such as skin dehydration, and secondly, it may be related to lipitis, perioral dermatitis and other diseases. 1. Physiological factors: If you often use your tongue to lick around your mouth or the skin around your mouth is dehydrated, it may trigger dryness and tightness around the mouth. 2. Lipitis: the onset of the disease and climate change, local stimuli and sun exposure and other related factors, mostly manifested as flaking, swelling, dryness and other symptoms, common in the lips and the surrounding skin. 3. Perioral dermatitis: the disease manifests itself as papules, dryness, scaling, etc., the most common part of the “mask area” (i.e., the perioral area, chin (chin), etc.), the cause of which is not yet clear, and it may be due to the long-term use of glucocorticosteroids, external stimulation and other factors. The cause of the tight dry skin around the mouth is not unique, after excluding physiological factors, patients are advised to go to a regular hospital to clarify the cause of the disease.