Medically reviewed by Jordana Haber Hazan, MD A horsefly bite, caused by a fly of the Tabanidae family, is painful but usually harmless, causing a raised, red area of skin known as a weal (much like a ...

Horsefly bites are extremely painful and can sometimes ... The red and raised bite can sometimes become a larger raised rash (called hives or urticaria). You may experience dizziness, weakness ...