Cockroach bites typically cause the skin to become bright red and swollen, similar to a mosquito or bedbug bite, according to CockroachBite.net. Roach bites are approximately 1 to 4 millimeters wide depending on the type of cockroach that caused the bite.
There are three species of cockroach most commonly known for biting: Periplaneta American, Periplaneta australasiae and the German cockroach, according to PestKill.org.
Cockroaches are omnivores, eating both plants and meat, reports Orkin.com. They rarely bite humans, but when they do, they bite the eyelashes, fingernails, feet and hands. If the bite is not cleaned properly, it could become infected. Infected bites may turn purple, red or green in color and filled with pus, according to PestKill.org. Infected bites require antibacterial medication.