Although, it has been known for some time that too much UV radiation can be harmful, new information may make this concern even more important. Recently, some scientists have suggested that there may be an association between UVA radiation and melanoma, the most serious type of skin cancer. While skin cancer has been associated with sunburn, even moderate tanning may also produce the same effect. UV radiation from the sun, tanning beds, or sunlamps may cause skin cancer and can have a damaging effect on the immune system. It can also cause premature aging of the skin, giving it a wrinkled, leathery appearance.