<Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr> <P> Angular cheilitis (AC), is inflammation of one or both corners of the mouth . Often the corners are red with skin breakdown and crusting . It can also be itchy or painful . The condition can last for days to years . Angular cheilitis is a type of cheilitis (inflammation of the lips). </P> <P> Angular cheilitis can be caused by infection, irritation, or allergies . Infections include by fungi such as Candida albicans and bacteria such as Staph . aureus . Irritants include poorly fitting dentures, licking the lips or drooling, mouth breathing resulting in a dry mouth, sun exposure, overclosure of the mouth, smoking, and minor trauma . Allergies may include to substances like toothpaste, makeup, and food . Often a number of factors are involved . Other factors may include poor nutrition or poor immune function . Diagnosis may be helped by testing for infections and patch testing for allergies . </P> <P> Treatment for angular cheilitis is typically based on the underlying causes along with the use of a barrier cream . Frequently an antifungal and antibacterial cream is also tried . Angular cheilitis is a fairly common problem, with estimates that it affects 0.7% of the population . It occurs most often in the 30s to 60s, although is also relatively common in children . In the developing world, iron and vitamin deficiencies are a common cause . </P>

What causes sores in the corners of the mouth
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