4-5 yr old tattoo get's itchy and raised, like worms underneath skin. Also MRI's cause the tattoo to raise and swell, same reaction like worms are under my skin. I haven't met a dermatologist yet that can explain this. Lately it's been having this reaction more. I'm assuming it could be the weather, it keeps going from winter to spring here where I live. All my other tattoos are fine, never had any adverse reactions. I've been told there could be trace metals in the ink that was used for the tattoo that has the problem, which is why it reacts to MRI's more. But do I need to be concered that it's been acting up more lately? I have one bump that stays constant on the top of the tattoo, it seems the itching and sweeling radiates around this bump. But again the whole thing swells and it feels like worms are underneath it. Any help or opinions would be greatly appreciated.