Seeing Spots: What You Need to Know about Skin Cancer [Photo Gallery]

Skin cancer is the most common cancer in the United States. In fact, more skin cancers are diagnosed in the United States each year than all other cancers combined. And the bad news is that the number of skin cancer cases has been going up over the past few decades. Here are some facts about detection and prevention. (Photos of skin cancers are from The American Cancer Society. All other photos are from Thinkstock.)