Here's what I have learned
1) Sometimes you have bumps that take time to heal.
2) I, like you, didn't think that I had a bump in and/or around tattoos. My dermatologist has confirmed that I am a "grower" of bumps. I have developed bumps both in tattoos and outside of tattoos post tattoo but the two don't seem to be MEDICALLY related.
3) My tattooer's to date have never tattooed a mole!