In genetically susceptible people, ultraviolet radiation from the sun is the main cause of skin cancer. But artificial radiation from sun lamps and tanning booths can also cause skin cancer.
Actinic keratosis is a precancerous lesion. It is caused by accumulated exposure to ultraviolet radiation from the sun. If left untreated, it may progress to squamous cell carcinoma (which occurs approximately 10% of the time).
A risk factor is something that increases your chance of getting a disease or condition.
Risk factors include:
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