Is it a normal thing for a horse to go up to a tree and repeatedly press against it with it's upper front teeth? I am watching her do it repeatedly and got to thinking it may have some tooth pain or something. It also has large welts all over its body that look like bee stings, ranging from a quarter to a half dollar in size.
Horse people? You mean Centaurs?
I mean people that know more about horses than they have four legs and a tail
I'm not a horse expert, but I was raised by one, and as a boy I spent more time than I can remember in stables.
The tooth thing sounds like tooth pain, or just a nervous habit, is it new behavior, or something that's been going on a long time? I'd have a vet or farrier check the horse's mouth either way.
Is there a hornet's nest near her pasture or stable? How about yellow jackets or some other type of ground nesting hornet ?
I'm sure that there is some type of topical treatment for the welts, but exactly what is beyond my knowledge.
I don't know anything about the horse, I just met her today. Seems otherwise healthy and has a good temperament. I've just never seen that type of behavior before and it stood out as odd or it being in some kind of pain.
Cribbing. Based on boredom as much as anything if my old sources are correct. .http://www.eastvalleyequine.com/2011/10/16/cribbing/
Horses will chew on just about anything they can in their coral / enclosure. My sister has a few and they murderized the bark on the trees in their enclosure (she had to chicken wire them).
Not sure of the psychology, but they are grazing animals and are used to chewing all day long. So when they are done with their food I am sure they are driven to keep on chewing on stuff.
Yep, that's what it's doing. I'm not sure how much land they have here but I'd guess more than 30 acres. I don't know if the horses are usually kept some where but they're freely roaming around the place today. One walked right up the driveway and stuck it head in my truck a minute ago.
Cribbing. They get high off of it. It's weird.
Be warned. They will "crib" on the hood of your car/truck. Right down to the metal in seconds.
The fix
We had horses years ago and used to have to be careful they didn't pick this up from other horses when they went to the county fair. "Cribbers" were always isolated in their own barns. Its basically a bad habit if I understand it correctly, but I think it can cause digestive issues. They generally make a burping sound when they do it and are ingesting large amounts of air directly into their gut, which is bad (again, if my memory from 25 years ago is correct).
In other words, horses are incredibly stupid.
Horses may appear incredibly stupid, but they aren't getting up at 4 a.m. just to drive 45 minutes and spend 12 hours a day at a job they freakin' hate, so they must be smarter than me, which probably isn't saying much.
Yup, cribbing.
Keep her away from the other horses, they're pretty smart and will teach each other to do it.
As for the welts, is it rainy where you live? Up here we get a thing called "rain rot" if it rains a lot and they stay damp, they can get a fungus growing in their fur which will cause the welts.
Ours has a rain sheet on during the wet weather and it really works.
Horses are meant to live on the prairie, not in a rainforest like where I live. This results in extra work for foot care and a few other problems.
Shawn
Snapped a picture before we left. The horses had wondered about a quarter mile away from the house. I also discovered that it's a he not a she. It's the solid brown one. 
A lot of horses react really poorly to horsefly bites. They can look like hives, but hives move around and bug bites don't.
If it's a he in with females it's a gelding - fixed male. That one is a chestnut (reddish brown).
Cribbing is a learned thing. Luckily none of ours know it or I'd be rebuilding stalls all the time. Horse do naturally chew on things a little though - like brand-new jump standards.
These are my two. Ella and Rev(alation). We also have a foster horse named Triscuit. They all like beer.
Ella is my buddy because I tell her she's prettier than Sarah Jessica Parker.
This is our American Quarterhorse, Hercules:
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