Medically reviewed by William Truswell, MD Actinic cheilitis (AC) is a precancerous lip lesion caused by ultraviolet (UV) exposure from the sun or indoor tanning beds. Lips may become very dry, ...

Angular cheilitis often goes away within two weeks when treated but can persist for weeks if left untreated. Actinic cheilitis is also called solar cheilitis because it is caused by long-term ...