Why do I have moles that I didn't have before?

you were probably in a lot of sunlight. It might be an indication of skin cancer, particularly when new moles appear or change shape or are irregularly shaped. If there are several new ones have a dermatologist examine them immediately. Skin cancer can be prevented by removing cancerous moles, but it can also be life threatening if it spreads too far because you don't have the condition checked out quickly. I noticed an odd looking mole once and had it checked within days of noticing it. The doctor removed it as soon as he saw it. Later tests showed that it was precancerous and could have turned into skin cancer.