Lately we have become so hyper-sensitive about sun exposure and the damaging effects it has on our health. Wearing sunscreen and using self-tanners can all help to prevent possible future outbreaks of skin cancer, but what about the sun exposure we've already had?

Unfortunately, there was probably a time when we weren't so careful. Previous sun exposure might cause skin cancer, so it's important for you (or a close friend) to check your skin. Look carefully at moles and beauty marks to see if they have any of these symptoms:

Fit's Tips: If you have any doubts about a specific mole, make an appointment with a dermatologist. They may perform a biopsy where they remove a portion of it and check for cancer. Since skin cancer is the most common cancer in the U.S. [0], it's better to be safe, so if they do find cancer cells or are unsure, they'll remove the entire mole. To protect yourself from future sun damage, check out these tips [0].

Source [1]