Horse turns pink

I have an Australian saddle, when I ride for any length of time, my mare turns pink wherever the saddle touches her. Not only where there is "pressure" but even where the lengths of the fenders and such are. The blanket is black, doesn't bleed (saddle doesn't technically touch her- it's thru the blanket). I thought perhaps since those areas are white, was just her skin showing thru her fur when sweating, but it lasts for days. It's not as bad where the girth is, but is a little bit evident in spots.

She appears to have sensitive skin- her coat is very, very thin in the summer and she easily looses hair with anything that rubs (beit me or equipment, or her) but she doesn't appear to be hurt or uncomfortable. Just turns bright pink for a few days.

Also, since she is prone to loosing hair wherever she is rubbed (including girth area, doesn't get sores unless being worked allot- and I avoid them) I was thinking of going with a "center-fire" rigging to pull the girth back a few inches. Anyone had any experience with this type of set up?

BTW- my horse just started riding, she's 4yo arabian/paint cross- so this pinkness and just simply new, but I don't know if she's had the issue "all her life" or just started- since she just started wearing a saddle couple of months ago (with any use).

Next time it happens, I will post pictures, but- it's pretty much just as I said. Just turns pink. Which I understand sweat/water makes white horse turn pink (skin shows)- but when she dries off, still pink. Not as much, but slowly fades over the course of a few days.

Maybe she is allergic to the material the pad is made of? It could be a rash. Your vet can help you figure out any allergies she has and (if they are serious) how to deal with them. For now you could try using a saddle pad made of a different material.
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What is the saddle blanket made of? Sounds like a reaction to the material or a chemical in the blanket.
Change the blanket & see what happenes.
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Pictures would be very helpful!

Right now she's not pink enough for it to really show in pictures so will try next time. I was thinking possibly allergies, but not raised, "rashy" or sensitive. (She is definitely the kind of horse that will let you know if she's uncomfortable or unhappy about something! - She doesn't "put up" with any nonsense) Just rather perplexing to me =) After I get few pictures I'll try maybe putting a thin pad under the blanket and see if that helps. I'm sure it bothers me more than her, since she seems to have no issue with it.

We have a sabino pony who is allergic to leather, and she seems react muchly the same way that your mare is reacting to your tack. If we tack her up with our usual leather tack, she turns a reddish pink color, and remains that color for 2-3 days. The only difference is that her skins turns a bit warm wherever the leather touches, also, and is very itchy. It took us months to figure it out, but when we did- we switched to a synthetic saddle and a nylon pony bridle as well as elastic reins, and she no longer has problems. Your mare might be allergic to whatever your girth and saddlepad are made of. Maybe try buying a cheap pad (or borrow it) of another type, and ride her in it. See if it makes a difference. Thin skinned horses tend to have more problems with tack fitting and such as a rule. It will most likely be a trial and error thing.

I ride anything sensitive with lambswool numner and girth sleeve AMAZING :) x hope you find what is causing it x