5. Genetic History.
This is not an exact, but one sign that you could end up or have skin cancer is if your parents of siblings have skin cancer. While there are environmental variables in play with this condition, the chances are higher if you have a parent or close relative that has skin cancer. Add any of the already mentioned signs of skin cancer to this and your risk is more than likely higher. Consider talking with your close relatives to see if they have any skin cancer signs on their skin and if so, make sure to report this to your doctor.