Our horse got them a week ago. I was panicking, but we got a bot knife and scraped really good, be careful so not to draw blood, I did but I followed up with peroxide on the legs and then vingegar, then of course rinsed and then sprayed with fly spray again real good. I even went as far as to use the bot wormer meds on his leg. Haha......and Then gve him the rest of the wormer internally don't want any hatching in the gut. But our horse seems fine and the places on his leg was gone in a day. GOod luck.