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.