Sunblock and Sunscreen:

Every year thousands of people use sunscreen and sunblock to protect their skin from the sun's ultraviolet rays. Sunblock and sunscreen do have some differences other than their names. According to About.com and the Library of Congress website, both sunscreens and sunblocks use natural and synthetic ingredients but function differently. Sunscreens filter a portion of ultraviolet rays while still allowing some ultraviolet light to reach the skin. Sunblock reflects and scatters ultraviolet light so that it does not penetrate the skin.

The sun emits three types of ultraviolet radiation. UVA which reaches the skin's deepest layer and promotes premature aging and skin cancer. UVB, the type of radiation that causes skin to tan and burn. UVC is a form of solar radiation that is mostly absorbed by the earth's atmosphere. Since both UVA and UVB types of radiation have been connected to skin cancer, it is best to use a broad spectrum sunscreen that protects the skin from both types of radiation.

Human skin and sunscreen products both contain sun protection factor or SPF. Natural SPF is based on the individual amount of melanin in a person's skin. Sunscreens add to someone's natural SPF based on the amount of SPF they contain. For example, when wearing an SPF 30, someone who can stay out in the sun 10 minutes before burning is given thirty times their natural SPF or 5 relaxed hours in the sun. The Mayo Clinic also suggests that protective clothing be worn to further minimize risk of ultraviolet exposure.

The world-renowned medical clinic recommends reapplying sunscreens or sunblock after 2 hours of sun exposure. People should be especially diligent when engaging in heavy physical activity while outside. Wearing sun protection all year around due to the fact that skin can still be exposed to UV light in cooler, cloudier weather. The sun also emits its strongest light between the hours of 10 am until 4 pm. Limit exposure to the sun during this time whenever possible.Visiting your doctor once yearly for a skin check may also help in prevention.

Melanoma is just one form of skin cancer caused by the sun's ultra violet rays. Treatment for skin cancer can depends on a person's ability to handle certain types of treatment, but many of said treatments are similar to those of other cancers. Sunscreens and sunblocks don't block all UV rays, but the vast majority are filtered. Knowing the difference between sunscreen and sunblock may help you decide what type of sun protection you want for a particular occasion. Following a few pieces of basic advice will reduce reduce your chances of skin cancer and premature aging.

Sources:

About.com

The Library of Congress

Mayo Clinic