Even tans signify an injury response to sunlight. UVB rays are the most damaging, but UVA rays, touted by many tanning salons, are also dangerous. In the least, they lead to wrinkled, leathery skin. One in 75 people develop skin cancer. It is important to be able to recognize precancerous and cancerous skin lesions.
Most benign lesions are symmetrical.
Asymmetrical lesions should be evaluated by a physician. Most benign lesion have smooth borders. Jagged edges merit evaluation. Most benign lesions are of one color. Multiple or variegated colors merit evaluation.