<prompt> Which of the following is associated with sun exposure?Actinic keratosisSeborrhoeic keratosisSebaceous cell carcinomaSyringoma  <response>: Ans. a. Actinic keratosis Ref: Roxburgh 17e p209-213; Fitzpatrick 7e p1007-1015; Rooks 8e p52.30-52.32Actinic keratosis or solar keratosis is a reflection of abnormal skin cell development due to exposure to ultraviolet radiation.ActinicSolar KeratosisPremalignant lesions occurring on the sun exposed part of the body in persons of fair complexion.It is raised, pink or grey, scaling or warty hyperkeratotic plaque or papule0.2 transform to squamous cell carcinoma.Treatment:Liquid nitrogen application is therapy of choice.5-FU for multiple superficial actinic keratosis.Imiquimod can also be used. 