First let me say I've never seen exactly that related to tattoos. Second, I am NOT a doctor, so take any advice with a grain of salt and follow it at your own risk.
I do have something like that which appears on my face from time to time. After multiple visits to the dermatologist, which didn't fix it, I finally came up with my own treatment. Whenever it flairs up, I just wipe the area down with plain rubbing alcohol three or four times a day to keep it dry. That usually works within a couple of days. Again, I'm not a doctor, but I don't think it would hurt anything for you to try that.
Good Luck.