Eyes/Non-crusty Brown spot in both eyes

I can't see what you're talking about.

But it's not likely to be an emergency. I'd watch it for several days, and if it doesn't change in that time, I'd wait until her next vet visit.

You can also see https://www.guinealynx.info/eyes.html and see if there's any information there.

I see it but some of my pigs have that too. I just assume it's normal. They've never had any problems from it.

Does it look like the edges of the iris are irregular? I can't tell from your photo but if it is, it could be Osseous metaplasia. Is she a senior and is she able to see? Here's a link to guinealynx that shows some eye disorders.
https://www.guinealynx.info/records/viewtopic.php?p=163#163

Actually, the lesions of osseous metaplasia are white, not brown, as far as I know. They look like a film of calcium on the eyeball.

Stella is 6 months old. I think she has had them all her life, I probably just never noticed them before. They look kinda like this (best sketch) it doesn't look like anything from those links, just as though the brown of her iris is smudged. After getting home from class I noticed her biological sister Luna also has their smudge, but Aurora does not.