I have a rash, itchy and redness and spreading, started on the buttock region spread to legs, arms etc., I am not sure what has caused this, I have been tested prior for allergies, and I am allergy to fragrences, nickel. I had Cashew butter for this first time a few days ago, I am not allergic to peanut butter, could this be the problem? Do you have any other suggestions for me to try. I am 72 years old male