Actinic Keratosis, also known as Solar Keratosis, is a pink or reddish skin precancerous growth usually caused by Sun exposure (Pugliese, 2001). They are often covered with a white, grey or yellow scale or scab which can be painful to remove.
Although actinic keratoses rarely develop into a Malignant Melanoma, they are known to develop into Squamous Cell Carcinoma.
Because actinic keratoses are considered precancerous growths, they should be examined by a dermatologist. Although topical treatment may be possible (application of a cream or ointment), some form of removal is usually necessary, typically cryotherapy (freezing), electical cautery (burning) or surgery.
NOTE: If you have a pigmented spots of which you are not certain you should visit a physician or dermatologist for an professional evaluation.
Prevention is better than cure!