For the last 4 weeks I have been on 300 mg/day Allopurinol.  Since this time I have noticed that my allergies have been out of control.  i.e. sneeze really hard and often, constant runny nose.  Also have a small (pea sized)red round skin rash just above my eye and under my eye brow. 
What's weird is that I don't normally get allergies and definitely never this bad.  I have tried Zyrtec, Claritin, and each of those with the Decongestant as well. 
My question is, would Allopurinol possibly make me more succeptable to pollen allergies?  I am in Arkansas and the pollen is extremely high this time of year, but like I said, have never really had them before this year. 
Thanks for the help.