Ultraviolet (UV) radiation from the sun is the number one cause of skin cancer, but UV light from tanning beds is just as harmful. Exposure to sunlight during the winter months puts you at the same risk as exposure during the summertime. Cumulative sun exposure causes mainly basal cell and squamous cell skin cancer, while episodes of severe blistering sunburns, usually before age 18, can cause melanoma later in life. Other less common causes are repeated X-ray exposure, scars from burns or disease, and occupational exposure to certain chemicals.
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if you mean bloods then no because they can be found as carbohydrates which is the starch you can also brake down in the stomach which can also be left as chemicals but yes most of the time they are found in the bloods and the white bloods cells and the red bloods cells help defending and carrying the chemicals which are found in the body
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