Your simply toxic if you cannot with stand eating one of natures finest fruits. Look at cleansing your Liver with Hulda Flushes along with Fasting and taking care of your GI.
Is it where you touch or hold the citrus? It might be from the juice touching or burning your hand.
I had this problem because I was hand squeezing A LOT of citrus while I was fasting. THe rash was in the plam of my left hand which is the hand I used to squeeze them.