Cause of a rash

I have a rash that one idea indicated it might be histamine caused. However, I went 26% over the top in a test for antioxidants meaning I rate super high with antioxidants. Do you think that would contradict the idea that I am eating too many foods containing histamines? Also most of the year have a runny nose from allergies and take homeopathic remedies to alleviate, but strangely now since I've gotten the rash I don't have a runny nose.