For the past 3 years you have not managed to get the vet to look at it, or better, get a new vet? Or even try to diagnose it yourself on the internet? Even simple nettle tea washing and applying of oil could help, if it is just "dandruff" or some sort of eczema. However, the best and only option is to get a new vet!!!!!!
It was nothing at first, we thought it was an allergy so we applied MTG and it got fine but he would always itch it to where the hair was sticking up in every direction, but it was never an open wound or like this. We're going to request she come out one more time and if she doesn't were having my friend contact her vet, but it would be quite expensive because the practice is an hour away. We try applying oil to help with the itchiness.
It looks sorta like tail rubbing, When was he last dewormed? When was his sheath cleaned last? Is the spray that you put in it moisturizing? The area looks a little dry. The rest of his tail looks mighty nice :) I hope you find a solution! :)
He is rubbing his tail! On his water bucket, walls, and stall door! He is due for a deworming this week, and our vet said to give him a double dose of ivermectin. His sheath was cleaned...last month or the month before. And the spray is moisturizing. Thanks, I just love his tail!
He is rubbing the hair off there because it itches. Sweet itch or some other allergy probably.
Does is go away a bit in the winter?
We first thought it was an allergy, but when we changed his food, bedding, and stall location, nothing helped. It gets MUCH worse in the winter, so that made me become even MORE confused!!
is your horse a gelding? if so, when was the last time his sheath was thoroughly cleaned?
my boy used to get like that all the time (not quite as bad but close). i used to show him so a bald tail head was a big no no
i always thought he was itching because of bugs (he is really sensitive to flies) so i would keep him coated in fly spray but it never really helped much.
the other thing i was careful about was to spray him off with the hose (or sponge him off in the winter) really good under his tail/between his back legs after a workout so the sweat/dirt would not make him itchy.
after a pretty nasty bout of tail rubbing my poor boys tail looked even worse than yours and my trainer recommended cleaning his sheath and checking for a bean. i cleaned his sheath really well (it was gross) and to my amazement he stopped rubbing and the hair slowly grew back. i now clean his sheath regularly and the problem has never come back (knock on wood)
He is a gelding, and his sheath was cleaned a month or two ago! I show as well and this is NOT nice! I never thought to rinse between his back legs, I'll have to try that! And I will clean his sheath next time I'm at the barn which should be tomorrow. I hope your boy never has to deal with it again!!