In general, tattoos within a year can not donate blood, if the tattoo time more than a year, after various checks qualified people are able to donate blood. Tattoo within a year, due to the need for a variety of dyes when tattooing, these dyes will continue to be absorbed into the blood, the human body has a certain impact, in order to ensure the quality of blood, tattoos within a year is generally not advocated for blood donation. In the tattoo, if the use of substandard medical equipment, may lead to the spread of various blood-borne diseases, such as hepatitis C, syphilis, AIDS and other blood-borne diseases, the window period of these diseases is relatively long, some reaching 3-6 months, that is, within 3-6 months, even if the body is infected with these viruses, but through the antibody test can not be detected. Therefore, in order to ensure the quality of blood and to ensure the safety of blood, people within one year of tattooing are not able to donate blood.