Although this post is old, I want to add my two cents worth as well because it may help lead to some sort of answer.
I, too, have been suffering with cold-like symptoms for three weeks now. Cold and/or allergy medications have not helped. About two months ago, I had the same symptoms, but only for about one week, then they went away until three weeks ago. Coincidentally or not, I also noticed that I had a bunch of bumps on my back.
The bumps don't itch and aren't red, but if you scratch or scrape them, they are extremely painful and sensitive.
Only today did I realize that the bumps are ONLY on my tattoos. There are no bumps, whatsoever, on any part of my back that does not have a tattoo.
I respectfully disagree with the above poster regarding allergies to tattoo ink. My research has shown that the various metals in the ink can cause allergic reactions in some people even years later.
I'm beginning to believe that I have an allergic reaction to my tattoos and it has spread to a histamine reaction in my sinuses. This is only conjecture, but I have decided it's time to go to the doctor for antibiotics and/or steroids.
Good luck to all!