Originally Posted by waresbear
From your pic, I can't tell if it's an insect bite. I would say most likely yes, being this time of year and they tend to be as you described, soft. Or could be a hematoma, meaning she was kicked but you usually see a kick mark or an abrasion of some sort. If it doesn't go down within hmmmm 2 days, I would have it checked by a vet.
actually since I had him almost 2 months, it was there. Looks too large for an insect bite but not sure how large is too large on a horse for an actual insect bite