Why does the skin around an insect bite itchBug bites itch because of your immune system’s response to the bite. When an insect, such as a mosquito, tick or flea, bites you, your body increases the white blood cell count in the area and produces histamine, a compound that cells release as their normal response to injury.

How Do You Stop A Bug Bite From Itching?
“Placing a cold compress like an ice pack or frozen vegetables in a bag onto the skin for two or three minutes can help suppress the itch of a bug bite,” Alston said.