http://emedicine.medscape.com/article/1099775-overview actinic keratosis http://emedicine.medscape.com/article/1099775-overview http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2924138/ actinic keratosis skin cancer actinic keratosis http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2924138/ http://emedicine.medscape.com/article/1099775-overview#a6 Actinic Keratosis Actinic Keratosis