Some media outlets are reporting the chance that multiple players got tattoos at the same parlor for autographs in return. If it is indeed true, then suspensions are possible. Players that may be involved include Pryor, Boom Herron, and Posey. The good news is that the story hasn't blown up yet. If it was more legit, ESPN and other major news outlets would probably be completely covering it by now.
Note: Here is another link to a blog post by Ken Gordon and Tim May of the Columbus Dispatch. According to that post, there is an investigation, but no names are given in the post.