Help with hair loss

I have a seven year old dun gelding. Recently I left his halter on him while he was turned out. It stayed on him for several days. His halter is not tight on him in any way. On one of his cheeks it rubbed the hair off. It's not a sore or anything just rubbed the hair off. I know the hair will grow back but now he has some spots like this on his chest and just in front of his back legs. It is not ring worm (unfotunately we have dealt with this on another horse before) or rain rot. It's not even sores. It's almost like his hair is so thin that when he touches something for a prolonged time it rubs the hair off. Any ideas what this could be from and how we could fix it?

My old man has a similar issue in the summer. Thin summer coat does not fair well when it comes to anything rubbing. And rubbing includes him rubbing himself on the wall, door, fence post, etc.

He too has spots on his cheek bones from his fly mask, yes his fly mask. His chest is looking sparse because the gnats bit him some and he scratched it to the point of a scab on the fence.

I try to be really careful and make sure everything fits him and he is well coated with bug stuff, but he seems to find a way to rub hair spots off anyway.

What do you do about it? Does the hair always come back?

I put cream on his chest to make it less itchy for him.

His fly mask (and his grazing muzzle)...well there is not much I can do about that. He needs it.

He does not have sores. Just lacking some of his hair.

Yes, he always grows hair back.

OK. Yeah, these aren't sores either just like the hair is rubbed off. I have been putting cream on his too. Maybe this isn't that uncommon?? Thanks.

Of my three, my old man is the only one that has this problem. His summer coat is soft and fine so it rubs off easily.

Vitamin E works well for growing back hair. You could also get those fleece covers for his halter if it is left on. When I boarded my horse I had to do this because his halter was required to be on for turnout and he is thin skinned so he would loose hair from the rubbing.

I was thinking about this issue this weekend. I assume you have confirmed that the hair loss you are experiencing is not caused by a fungus.

Yes. He was at the vet this past weekend. Not from a fungus.