Ummm...Actually Ivermectin has a very very very very LOW chance of overdosing...Like you can dose a horse with 60 times the standard dose without complications. Not that you should ever do that, but, you get my point. Ivermectin is probably one of the safest dewormers on the market.I would not do the ivermectin! It is very easy to OD on it, and a little goes a long way. I also highly doubt that a maggot would remain on that part of aliving horse for more than a few minutes. Is it possible there is foxtail in her pasture? It causes ulceration of the mouth and digestive tract. Pics would help.
Yes,Equine herpes virus is definitely possible. I always thought it was herpes encehpalitis but it appears there are other forms, too, based on what I read at link below. Sores Inside Horse's Lip? (Pics Included) - Page 5
Do your horse's sores appear to be very painful to the touch?
Our horse is very prone to this. Our vet advises the same as you noted as well as use Ivermectin orally every two weeks until the would is healed over. I do gently clean the wound with saline first and that seems to also support healing. I wish the sores our horse gets would heal in 3-4 days, but they generally take a few weeks. They will start to look better in the shorter period.More than likely you are talking about a summer sore. What that is is simply fly larvae that have been deposited on a break in the skin. The easiest way to deal with it is to rub ivermectin paste dewormer on the sore until it goes away. Maybe 3-4 days.
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It used to look like that but it is getting smaller and smallerOur horse is very prone to this. Our vet advises the same as you noted as well as use Ivermectin orally every two weeks until the would is healed over. I do gently clean the wound with saline first and that seems to also support healing. I wish the sores our horse gets would heal in 3-4 days, but they generally take a few weeks. They will start to look better in the shorter period.
FYI: This pix is a pretty blown up sore. They pop up pretty quickly, so the sooner you catch it the better.