My horse has come up in bumps under the back left hand side of her saddle, i'm having her saddle checked on thursday to see if thats the cause, any other ideas of what they could be? Theyre not itchy for her, they're quite hard aswell, there's a little cluster of about 4 bumps, heat bumps maybe?im giving her this week off too because she's lost a shoe and maybe they'll go down a bit, any ideas greatly appreciated . By the way, I sponge her off religiously after a ride! If they don't get any better i'll get the vet to take a look.