Cheilitis is inflammation of the lips. This inflammation may include the perioral skin, the vermilion border, and/or the labial mucosa. The skin and the vermilion border are more commonly involved, as the mucosa is less affected by inflammatory and allergic reactions. It is a general term, and there are many recognized types and different causes. Cheilitis can be either acute or chronic. Most cheilitis is caused by exogenous factors such as dryness and acute sun exposure. Patch testing may ident