I Have Bruises From An Insect Bite That Itch Really Bad, What Bit Me?

I have insect bites on my hands, arms, legs, and foot. The bites on my arms and legs are large oddly shaped and miscolored like bruises which are raised. The bites on my hands and foot are circular and painful with which appears like the poison is surfacing in a bubble on each bite. All of the bites itch very badly almost unbearable. What type of insect could have done this?