Horses hair grows back a different color.

Okay well I posted this question in my update thread about my pony Flopsy. She is low on the totem pole so tends to get picked on more then the other horses. She has two bites on her back that the hair has grown back dark bay (she's chestnut). I know like with saddle sores the hair usually turns white but is it normal for a bite or scrape or whatever it may be to have the hair grow back a different color then the horse itself? The bites are old, but I just noticed the hair grew back a different color. There's also a bay patch on her whither where the saddle would sit, but I know it's not a saddle sore because I haven't been riding her lately or constantly and there was no sore there ever since I've owned her.
Thanks :)
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Yep - totally normal and when her coat shifts next season the patches will shed back to her normal colour.
I clipped my boy a few weeks ago, he'd been out in the paddock for 12 months and like your mare, was the lowest in the pecking order so copped a lot of bites. The bites have grown back in very dark, and now it looks like he has spots all over his back and rump. I'll have to put up a photo so you see that your horse isn't the only weird spotty one :P