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[ruben]

Squamous cell carcinoma (SCC) is the second most common type of skin cancer. Together with basal cell carcinoma, the most common skin cancer, these two cancers are collectively referred to as nonmelanoma skin cancer.

SCC will be caused by exposure to the sun's harmful ultraviolet (UV) rays. The risk of developing SCC increases when a person also has one or more of these risk factors:
Fair skin.
Blonde or red hair; blue or green eyes.
History of indoor tanning.                                                                                             
Diagnosed with actinic keratoses (AKs).
Family history of skin cancer.
Weakened immune system (immunosuppression).
Received radiation therapy.
History of exposure to coal tar products or arsenic.
The risk of developing SCC also increases with age because each exposure to harmful UV rays causes more damage to the skin. As this damage accumulates, the risk of developing skin cancer grows.

PREVENTION
Avoiding unprotected exposure to the sun's UV rays is the primary form of skin cancer prevention at any age . Here's how you can Be Sun SmartSM:
Generously apply a broad-spectrum, water-resistant sunscreen with a Sun Protection Factor (SPF) of 30 or more to all exposed skin. "Broad-spectrum" provides protection from both ultraviolet A (UVA) and ultraviolet B (UVB) rays. Reapply approximately about every two hours, even on cloudy days, and after swimming or sweating.
Wear protective clothing, such as a long-sleeved shirt, pants, a wide-brimmed hat and sunglasses, where possible.
Seek shade when appropriate, remembering that the sun's rays are strongest between 10 a.m. and 4 p.m.
Use extra caution near water, snow, and sand because they reflect the damaging rays of the sun, which can increase your chance of sunburn.
Get vitamin D safely through a healthy diet that may include vitamin supplements. Don't seek the sun.
Avoid tanning beds. Ultraviolet light from the sun and tanning beds can cause skin cancer and wrinkling.

Source:
http://www.aad.org/public/publications/pamphlets/sun_squamous.html