Rheumatoid Arthritis Support Group
Rheumatoid arthritis is a chronic, inflammatory, multisystem, autoimmune disorder. It is a disabling and painful condition which can lead to substantial loss of mobility due to pain and joint destruction. The disease is also systemic in that it often also affects many extra-articular tissues throughout the body including the skin, blood vessels, heart, lungs, and...

But allergies? That sounds like Sulfasalazine, when I got rashes with no bumps. And then later, when I tried again (no the doctor did not tell me to try, I was trying to cope with a med failure, and at the time it seemed like an option to me.) I had the worst case of hives you could imagine.
What about PsA? Psoriatic Arthritis? It comes with a nasty rash, from what I understand.
That's all, let us know if you ever find out the problem.
But don't bug bites usually subside after 24 hours? This is since about 8pm THURSDAY evening (EST) which is now 36 hours ago. Cortisone ointment helps a tiny bit ?
I am 57 have seropositive RA and sjogrens too with ra vasculitis too. I did get the shingles, pneumonia and flu vaccines this past year, six weeks apart, before I was able to get remicade infusions. I had a severe outbreak of painful blisters after getting the shingles vaccine - i believe it gave me a outbreak of shingles. I wonder if it was a bad move to get the shingles vaccine?
Also, I have itchy rashes all the time too. Is this a part of the RA I wonder?