I ve had my tattoo for 3 years now, and I have never had a problem with it until lately. For the past few months, there has been a single, almost unnoticeable bump under the ink. It never bothered me so I dismissed it. But a few days ago, I noticed the bump was filled with pus, and I popped it. Now the bump has grown larger, there is no visible pus, but it is a bit painful to the touch. Should I be concerned?