He has a very sensetive coat, but the skin is fine, he's not sore, his hooves are hard and the mane and tail too :) It hasn't come after one ride, but it started slow and then I realized it wouldn't disappear just by washing the pad.
The vet hasn't found anything, his food is analysed and made sure to cover everything he needs. He doesn't show any other weaknesses except the sensetive coat.
I know other standardbreds around here that's equally sensetive, especially now when it's time to shed. He doesn't have any marks on his face or other place now, but he got it the first few days I've had him, and I've seen that the blankets has ruffled up the coat on his hips before, it stopped when I used showsheen on his hips and I try to avoid blankets.. But except this little spot I've managed to keep him from any visible marks in his coat (I've payed attention when I've noticed the areas were ruffled, before it got so thin/short it changed colour). So it's not normally a problem as long as I don't make him wear a halter in the stall or pasture, and avoid blankets/makes sure to get blankets with good insides.