Actinic cheilitis

Actinic cheilitis, also known as solar cheilitis, is the counterpart of actinic keratosis of the skin and can develop into squamous cell carcinoma. In actinic cheilitis, there is thickening whitish discoloration of the lip at the border of the lip and skin. There is also a loss of the usually sharp border between the red of the lip and the normal skin, known as the vermillion border.

Causes and Treatment
Actinic cheilitis is caused by chronic and excessive exposure to ultraviolet radiation in sunight.

This condition is considered premalignant because it may lead to cancer, and should be treated accordingly.