I have recently started seeing these in the black ink on some of my tattoos but only the ones I’ve had in the last 4-5 years. Any older than that have no issues. And an exception to one on my foot that I’ve had in the last few years that isn’t bothered. It’s mainly one big one I have on my arm that has lots of colors but they are only in the black ink. They don’t look like pimples, can’t be popped, and their size hasn’t changed since I’ve noticed them. Sometimes, they itch but not often. I’ve been thinking of seeing my dermatologist about it because I’m not done getting tattoos lol.