Some years back I came out in a painful, itchy rash but after several doctor appts, none of which resulted in any relief, I took matters into my own hands. I eliminated some of the most common foods that people can be allergic to, eggs, wheat, nuts, one or two others, and after a few weeks the rash cleared up! Yes, sweet relief. I added them back one at a time over many months, and the outcome was that I had become allergic to eggs. Strangely tho, when I tried eating eggs again, it took two weeks for any rash to occur. So if you are tracking what you eat, you may get a reaction in minutes or hours, or it may take weeks.
Looking back, I would have thought that a dermatologist worth their salt could have looked a my arms and legs and said, "That's an allergic reaction to eggs" but not the one I went to. He swore it was a topical reaction and said to use this soap and shampoo when I showered and wash my clothes and sheets in detergent X, yada yada. Meanwhile I continued to suffer. I now have no faith in the medical profession. Unless you have broken bones and/or gaping wounds, you are better off using Dr Google and your own common sense.
_________________
Your neurodiverse (Aspie) score: 120 of 200
Your neurotypical (non-autistic) score: 74 of 200
You are very likely neurodiverse (Aspie)
AQ = 38 MBTI = ISTJ Gender = Non-binary
I strive not to perseverate. You can PM me for more info.