Eczematous cheilitis
Also termed "lip dermatitis", eczematous cheilitis is a diverse group of disorders which often have an unknown cause. Chronic eczematous reactions account for the majority of chronic cheilitis cases.It is divided into endogenous (due to an inherent characteristic of the individual), and exogenous (where it is caused by an external agent). The main cause of endogenous eczematous cheilitis is atopic cheilitis (atopic dermatitis), and the main causes of exogenous eczematous cheilitis is irritant contact cheilitis (e.g., caused by a lip-licking habit) and allergic contact cheilitis. The latter is characterized by a dryness, fissuring, edema, and crusting. It affects females more commonly than males, in a ratio of about 9:1. The most common causes of allergic contact cheilitis is lip cosmetics, including lipsticks and lip balm, followed by toothpastes. A lipstick allergy can be difficult to diagnose in some cases as it is possible that cheilitis can develop without the person even wearing lipstick. Instead, small exposure such as kissing someone who is wearing lipstick is enough to cause the condition.Allergy to Balsam of Peru can manifest as cheilitis. Allergies to metal, wood, or other components can cause cheilitis reactions in musicians, especially players of woodwind and brass instruments, e.g., the so-called "clarinetists cheilitis", or "flutists cheilitis". "Pigmented contact cheilitis" is one type of allergic cheilitis in which a brown-black discoloration of the lips develops. Patch testing is used to identify the substance triggering allergic contact cheilitis. Infectious cheilitis
Infectious cheilitis refers to cheilitis caused by infectious disease.
The lips appear dry, atrophic and fissured. Angular cheilitis is sometimes also present. Other causes
Lupus erythematosus, sometimes termed "lupus cheilitis"
Crohns disease (angular cheilitis)
"Nutritional cheilitis", e.g. pyridoxine (vitamin B6) deficiency
Lichen planus
Pemphigoid
Xerostomia

References
External links

 Media related to Cheilitis at Wikimedia Commons