Gnats are tiny flying insects that feed off of blood. Gnat bites can be very itchy and may swell as large as a mosquito bite. Individual reactions to these bites can vary. Some people experience only a mild effect, while others experience extreme itchiness from these bites. Serious illness from gnat bites is very rare, but itchy skin is annoying. Fortunately, whether the itchiness is mild or severe, you have several options at your disposal for treating it.
Cleanse the bitten area of skin with soap and water. If you have bites over a large area of your body, this is best done in the shower. Otherwise you can simply spot-clean your skin with water from a sink.
Pat the itchy areas dry with a soft towel. If you have bites only over a small area of your body (one arm, for example) apply an antihistamine or hydrocortisone cream to the bites. Drug stores and many grocery stores sell these creams over the counter.
Wear loose, breathable clothing that will not irritate the bites. Avoid scratching gnat bites or they may bleed and/or become infected. Re-apply topical anti-itch medicines according to the directions on the label (usually every 4 to 6 hours). Keep the skin cool and clean.