What part of the obligation would that violate?
It is the internal qualifications not the external qualifications....
I can tell you that there is NOTHING in the GLOT landmarks, or the law book that forbid tattoos of any kind in any manner. I just had to research this specific topic since we had an elderly member tell a young EA, with many visible tattoos, that he shouldnt be a mason if he had tattoos. It wasnt his place to say anything like that and it hurt the EA and his opinion of the member, and the lodge.
Anyones personal opinion of tattoos have no place in the lodge. You can hold your own opinion but exhibiting restraint in expressing them is a mark of maturity and true Masonic beliefs.
Dont let the presence of absence of a tattoo taint your opinion of anyone.
Eric