I have been taking benadryl for the past 3 years going through I.V.I.G treatment , for 2 years. Since last year I still continue take benadrly every night for my allergy. Last May I had spinal surgery and developed for the first time thrush in my mouth, and was treated with Nystatin. In sept I had a tooth implant and was on z pack for five days, develop thrush again , was treated, but there is a very small area on my upper chick inside my mouth still is a little pink. I am seeing an E.N.T next Monday. could it be some thrush or something else.