i had a large blister on my foot it made my achilles swell. the next day the blister turned into a blood blister, and grew in size. i went to the doctors and he said i had cellulitis and prescribes me antibiotics. i had the usual symptoms of fever and chills. i used polysporn on the blister several times. today the swellings hurts more, and the blister has grown even more and now looks like its white inside. is this normal or is it the polysporin inside it now? i heard many people have to go to the hospital with cellulitis, how do i know when i should go?