Tanning booths use ultraviolet A rays. Ultraviolet A rays are less harmful than ultraviolet B rays but exposure to them in a tanning booth probably still increases your risk of skin cancer. African-Americans and other people with dark skin are at very low risk of skin cancer. They are naturally protected by the melanin, the dark pigment, in their skin. You can become allergic to sun screen.
Skin cancer is very treatable, particularly when found early.
One should periodically check one's own skin and in areas one can't see have a spouse or relative check. As part of regular physical examination, remind the doctor to check. Any growth the size of a mole is of concern. Sores that don't heal, red scaly patches, and nodules are other signs of skin cancer. Moles that change in color, height, sensation, shape, size, or texture should be checked by a doctor.