Do gnats bite? Only the female black flies suck blood. The venom that is injected into the skin results in itching, swelling and soreness, according to Iowa State University.

A warmer climate has begun to take hold in the state of Washington, bringing in new hordes of gnats. Black flies, also known as buffalo gnats, can cause irritated, itchy bites but do not typically ...

What do black flies look like? Black flies are a small, flying insect often with a "humpbacked" appearance that bite animals including humans to suck their blood, according to MSU.