Thank you everyone for the suggestions and tips!
She doesn’t show any signs of rust or mold and she doesn’t smell like mold or anything like that.
I would love to show photos but I still can’t figure out how
They are spots and ligns, very uneven and on the tips of her hooves and ears. She came from a lot where some of the ponies had also spots and others didn’t. And there was a Sugarberry with the bright red hair in the lot so I first thought it was maybe from her?
Oh and I know these spots can be on pink ponies. I have neon spots on Galaxy and Lady Flutter but these look different. Sweet Clover‘s aren’t round like the spots on the other two.