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Definition of Tattoo

Tattoo: The permanent insertion of ink below the skin, using a sharp instrument. Humans have done tattooing for cosmetic and ritual purposes since at least the Neolithic era. Today the practice is made relatively safe by the use of nonreactive pigments; sterile, disposable needles; and sterile work conditions. Without these refinements, inks may cause inflammation, and infection is an ever-present danger. Persons who are prone to keloids should be aware that tattoos can trigger these heaped-up disfiguring scars. Ink lines may also spread or change color over the years, a fact of special concern for those interested in so-called 'permanent cosmetics' (tattooed lip color, eyebrows, eyeliner, and the like).

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=11312
Last Editorial Review: 3/19/2012

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