I have my coat of arms on my left shoulder which has quite a bit of red ink. To this day many years later, it still itches from time to time. What's really fucking weird is that it just so happens to be itching while seeing this post.
I had an allergic reaction to one of the dyes in my first tattoo. It didn't look anything like that, but my skin fell off in chunks. All better now, thankfully. And re-tattooed in another color. LOL