I am taking medicine, fluconazole, for fungus infection in my mouth and on my vocal cords. I have vocal cord cancer and at my last visit to dr. I showed fungus. I have another appointment on the 14th and have started a severe rash on arms hands and lower extremities. Called a pharmacist tonight and am taking liquid benadryl. He said it would not counteract the medicine. I can call my doctor tomorrow but need to know that the benadryl is ok to take tonight. I cannot have fungus at next exam because it interferes with cancer diagnosis