we are all born with it...something triggers it off in life...depends on what type you mean...skin cancer to prevent is stay out of the sun...if you go in it keep covered up...wear sunglasses even in winter when its bright as its the rays....i know that because i have had it twice...hope i helped you a little....
Iâ€™m guessing English is not your first language.
Are you asking if CTs cause cancer? The answer is no. They help diagnose cancer and other medical problems.