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You might have developed an allergy to the dyes.

More then a year later and it's on none of my other tattoos. If I was allergic it would have show up right away and on my others too.
Allergies CAN develop over time. My former boss had her tattoo (and 2 others) for 3 years before she became allergic to it and had to have it removed. None of her other tattoo's have so far been affected. It is possible, I'm not just pulling that information out of nowhere.

Good luck with it.