Actinic keratosis is a type of non-cancerous skin growth caused by the sun's ultraviolet rays. Treatment options for actinic keratosis include topical medications, cryotherapy, laser therapy, and photodynamic therapy. Topical medications, such as 5-fluorouracil, imiquimod, and diclofenac, work by destroying the abnormal cells. Cryotherapy involves applying liquid nitrogen to the affected area to freeze and destroy the abnormal cells. Laser therapy, such as the pulsed dye laser, destroys the abnormal cells without damaging the surrounding healthy tissue. Photodynamic therapy involves applying a light-sensitive cream to the skin, which is then exposed to a special light, killing the abnormal cells. All of these treatments are effective in killing actinic keratosis, but it is important to discuss the best option with your doctor.