Skin allergy to rubber | My horse gets little bumps on his skin after I give him a good curry, and I'm thinking it might be because of the rubber curry. Has anyone else seen this?

This happens with my friends horse Woody after my friend currys him he gets like rain rot or something!
Thanks for the response! I wash my brushes very often and it doesn't make a difference, so I don't quite think this is it. I'll mention it to the vet next time she comes around, but as it isn't really a "problem" per se- it doesn't bother him, he loves being curried.
This happens with my horse too,normally if I wash my curry really well and let it dry then he doesn't get bumps if that doesn't work then I would just ask your vet to confirm
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