What Causes Pus Filled Blisters On The Legs?

Hi, i have a question i went to the Dr for what he thought could be scabies he prescribed me permethrin the second dose was used this friday and today i noticed a new itchie bump with liquid inside of it on my leg please help i have washed and shampoo the carpets washed everything in hot water . what can i do im so tired and have had little sleep.