I Have An Unexplained Rash, Sometimes With Blisters On My

I have an unexplained rash, sometimes with blisters on my face, backs of my hands and tops of my toes. Tomotoes, Cinnamon, bananas, maybe vinegar and other foods seem to make it worse. This has been ongoing for several months and has evolved from dry lips in June/July of 2016 to cold sores and a painful blister on my tongue in August. I quit eating bananas and the blister went away. Then a rash appeared under my watch band, and has evolved to this rash on the backs of my hands and arms, tops of toes and face around the eyes. Is this some type of food allergy or could it be something like thyroid? I have given up eating most sugars, all grains, black tea, eggs, tomatoes, cinnamon, onions and other foods that a nutritionist tested me for intolerance with.