Gnats bite, according to KidsHealth. The tiny flies, sometimes called midges or blackflies, belong to a group of insects that includes mosquitoes and flies. Gnats live around the world near bodies of water, where they lay their eggs.
Gnats need the blood of animals to live, KidsHealth notes. They typically do not bite through clothes but get under clothing or hair to bite people in locations such as the ankles or the waist. Someone who is bitten by a gnat may not be aware of it when the bite occurs until he experiences swelling around the bite area. Bites typically itch and can hurt. Treatment for a gnat bite includes washing the area with soap and water along with applying antiseptic in case the gnat carried bacteria. Anti-itch creams can also be used to treat gnat bites.