The only way to know for sure is to have any questionable skin irregularities examined by a qualified dermatologist. Yearly skin exams are recommended for all, and more frequent skin exams for people with a personal history of skin cancer. Self screening plays an important role in the early detection of skin cancer as well. You should examine your skin periodically, taking note of any changes. Use a mirror to check your back, and remember that skin cancer can develop anywhere on the body, even in places that are not exposed to the sun. Pay close attention to any new moles or growths, as well as changes in the color, shape, or size of existing moles. Moles with irregular shape and uneven or ragged edges should be evaluated immediately. Red, scaly patches and sores that don’t heal may also indicate a developing skin cancer. Call for an appointment if you have questions or concerns about any changes in your skin.