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Regretting that tattoo you got? Cheer up: There's a good chance a dermatologist can remove it for you -- but success is going to depend on a number of factors, including how big the tattoo is, what colors it contains and whether you smoke.
Italian researchers who treated 352 people between 1995 and 2010 say they are the first to fully explore the factors that make some tattoos harder to remove than others.