each company for donating plasma has a different policy on this. the plasma center near me will only accept you if you dont have any tats less than year old and only if you have six or less. however, the center in the next town over pays more, ur tats only have to be six months old and it doesnt matter how many you have. i would call your plasma center, dont give them your name over the phone that way they dont know before you go in, and simply ask them. no one here will be able to tell you what you need to know unless they are donating at the same center you are.