I have Masters degree with Distinction and Student of the Year Prize in Corrosion of Engineering Materials from Imperial College London, first degree in Chemistry from University of Central Lancashire and also did Technology, Material Science and Engineering and Mathematics from the Open University.
In areas where tattooing is not as closely monitored, people are asked to wait for 12 months to give blood after getting a tattoo. This waiting period ensures that the donor is free of any potential blood-borne diseases which could have been passed on unsanitary equipment.
No, you can donate blood if you have a tattoo, especially if you have the tattoo done in a state that regulates Tattoo practitioners. Otherwise you have to wait 12 months if you have had it done by an unlicensed person. Tattoo is no more a taboo..