Okay, serious moment: most horsefly bites are just annoying and ugly. But if the redness spreads hugely, you get a fever, or the area feels hot and oozes pus, see a doctor. That’s a sign of infection, and we don’t want that.
Horse Fly Bite Red Line at Rachel Vance blog
Also, if you get a bite on your eyelid or near your eye? Ooof. That swells up like a cartoon character. Ice it, and if it looks like you’re in a boxing match, call your doc. But for 99% of bites, it’s just nature’s way of saying, “Hey, you’re outside! Have some drama.”
