What Causes Itchy Blisters On The Fore Head Post Treatment For Thrush?

four months ago i took an antibiotic and got thrush. my regular doctor did two rounds of flucanozole and nothing. i went to my gynocologist and she treated me with two round of nystatin mouth rinse, still not gone. now i have itchy skin and little white blister like bumps all over my forehead, im at a loss as to what this could be. the mouth swab came back as negative for anything and i was std tested as well, all negative