My Warmblood has bumps on his back. They are quite hard & seem to develop under his skin. One or two have come to the surface & are hard. Does anyone know what they are?

also going to try a fly spray with deet in it xxx
Could be fly bites Benadryl also helps those
I will ask about Benadryl......thanks so much xxx
Thanks guys. They aren't saddle sorse or an allergic reaction. I have had a few vets look at them. They don't hurt him. I have had the saddle checked quite a few times and i use a gel pad.
Possible saddle sores
Could be an allergic reaction. A friend of mines horse got a bunch of bumps like you explained. She gave him Benadryl for like 4 days
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