My tattoo is about 4 months old and fully healed. It's a medium sized tattoo on the back of my neck and it healed up fine without any problems. Yesterday I noticed there are tiny bumps all over it. You can't really even see them but I can feel them. I never had this problem with my other tatts so I have no idea what this is. All I know is they weren't there a couple of weeks ago so they recently popped up.
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— Jason Markusoff (@markusoff) December 5, 2013
It kinda feels like a heat rash or goose bumps.
It's possible to develop and allergic reaction to ink even after months of having it.
It could also be due to seasonal change, since we're getting to that point where the seasons are changing this can irritate some tattoos. Best thing you can do is just keep it moisturised. But you may want to check with your tattooist or a doctor to see what they have to say.