Many culprits can be the cause of a horse with an itchy face, and horses with itchy faces may try to scratch the itch in places that aren't safe – like human bodies or fences, trees, or stall walls with sharp corners. Horse face rubbing can be a cause of bald spots, and all potential causes of itching – such as allergies, skin issues, insect bites, sunburn, or fungal issues should be explored with your veterinarian.