There's this horse I used to have. I don't have any pictures, but I'll try to find some tonight. She was a buckskin, but on the left side of her rump there was this random spot. It was at least about the size of my hand. It wasn't white, but it would lighten and darken with the seasons. In summer you'd see it no problem, but in winter you couldn't really see it at all. It's like an off-coloured spot of her body colour. And to be exact she was a golden buckskin. I'm not sure if it was a hereditary thing, because I saw pics of both her parents, the mother being a flaxen chestnut QH, and the father a black & white paint. Also I know even though she was registered as a solid coloured paint, her lineage was 3/4 quarter horse, and only 1/4 paint.
I'm just wondering what the spot is. Any thoughts?