I am a tattoo artist of 17 years, I have seen this happen through the years... including on my ex wife.
My theory is that people tend to see this reaction, years later, if they have a slight allergy, and their immune system has recently been at war with a virus (or in your case super charged by supplements).
Its annoying, but nothing to worry about.
I find that a good Cortizone cream helps, especially Cortizone for Psoriasis. If it gets worse or itchy, take some Benadryl.