Skin Cancer Warning Signs Actinic Keratosis Pre-cancer In areas of sun exposure Scaly, red, or thickened area Squamous Cell Cancer Scaly area that crusts or bleeds An ulcer that does not heal Abnormal raised area Basal Cell Cancer Open sore Shiny bump Pink growth Reddish patch Scar-like area ABCs of Melanomas Asymmetry Border - irregular border Color - multiple shades of brown Diameter - larger than 1/4 inch