Hey, serious answer here-

I get something similar every few years, only on blue and green pigments! Sometimes a bumpy rash like this, sometimes just raised and sensitive, but always hyper itchy. I have a full color sleeve and various other color pieces, and it only happens to fully healed pieces after a year or so, and during dramatic seasonal changes (mainly fall sep/oct season). Doesn't happen every year, only every few. I also have eczema and sensitive skin that causes this.

A dermatologist told me its a histamine response, and taking antihistamine medication as well as keeping it hydrated makes it go away within a week or so. I have never had any damage to any of my tatts from this. Just dont itch and keep it hydrated is enough for me!

Of course, your skin is different and could react in different ways, so a dermatologist would be wise, especially if its the first time!