Horse with dry skin?

Okay well my new mare is a bit of a neglect case. (turned out to pasture for a year with no real job other then eating, minimal grooming, as well as lacking good all around care)

Needless to say she was givin to me and her buddy was givin to bittybockets parents.

I have been grooming and spending time with her everyday since I got her a week ago and her coat is starting to look wonderful already in such little time. But, I have noticed that she seems to have pretty dry flakey skin in some areas. She has this bald patch that seems to resemble a bite from another horse that constantly flakes pretty badly and it looks pretty old and no hair has grown back in it yet. The cut is about the size of my pointer finger.

I'm assuming that the dry and flakey skin is from lack of grooming all around. She also has an oober thick coat that she is shedding off in good amounts.

Today I hosed her off because she sweats during the day because her coat is so thick. I was going to shave her but it is already shedding out in great amounts and at night it does sometimes still dip around 31 degrees and I don't have a blanket to fit her. Nor do I like blankets for that matter.
Once I hosed her off today I was using the sweat scraper to get off the excess water and there were little dandruff like particles all over the dry skin areas of her body. They showed up more and more as I hosed her off ...

So I mean would this be a normal thing for a horse not properly groomed in a year? (I kinda figured that it is)
Also, is there anything that I can do to help her out with her dry skin? It doesn't seem to bother her in any other spot but under her chin. It's rough and bloody and scapping. I've been putting the expensive Vetericyn Wound Care spray from tractor supply on it but any other opinions on this would be wonderful.
Thanks!
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I would think that Flax seed would help you out with her skin. It seems normal to me for her to have dandruffy, flaky skin if she's been seldom groomed in the last year, too.

Give the spot under her chin time to scab up. I only use vetericyn when I first see a cut for a few times. As long as it isn't infected you should be fine. As for the missing hair where other horses may have bit her, get some MTG. You can buy it a tractor supply. They have the instructions on the bottle how to use it, but it did wonders for my gelding when a mare kept biting his rump.
My gelding also has dry skin. If you have a local feed store go and check out there horse section. I found this pink bottle specifically for dandruff and dry spots. I can't remember the name of it but I can only find it at feed store. It works really well and I only have to use it every few days.
I'll go to the barn and get the name of it if it will help you.
I hope I helped!

I would definitely say that is an effect of not having been groomed for a year or so. Feeding flaxseed is a good way to help the condition of her skin from the inside out.

A few good shampoo baths once its warmer can also help get some of the deep down crud that's hiding under her thick coat.

A magical concoction that I love as a spray on/curry in/make shiny type treatment is 1/2 listerine, 1/2 Infusium leave in conditioner and then a decent size squirt of baby oil. Shake it all up in a spray bottle and have at it!
The Listerine helps get rid of crud, the Infusium moisturizes and the baby oil helps condition and shine (don't put too much in or it will be greasy though!).

I had a OTTB gelding that was insanely dandruffy and gross. I just used a few sprays of the magic mixture with every grooming, and he was sleek and shiny allover within a week.

Its also great for itchy tails!

Hope this helps!