Licking the lips to remove excess saliva dries out the area, which prompts more saliva, perpetuating a cycle. After a while, the area becomes cracked and dry, causing irritation and inflammation, as well as ulcers. This is an example of non-infectious angular cheilitis, which can also be caused by nutritional deficiencies, sun exposure, poor-fitting dental appliances, or contact allergies. People with dermatitis, anemia, or abnormal skin folds that allow saliva to collect may also experience this type.
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