Suggest Treatment For Itching After Flea Bites

Hello, I recently moved into a new apartment and the people that lived here had 3 cat and after I moved in I found out that the place was infested with fleas. I can't even walk to the bathroom with out getting bitten. My question is I have 2 bites that have blistered up this is the first time this has ever happened to me. They itch but only a little bit should I be worried?