Dark spots on Tolumnia leaves. Natural pigmentation or infection?

[RiverbankMudlark]

I was in the middle of watering some of my plants when I noticed a bunch of these dark spots on my tolumnia's leaves (if it at all helps, it's a Jairak Flyer "Red Cherry"). They look sort of reddish-purple, so I'm hoping they're just anthocyanin (if they are perhaps I should move the tolumnia a bit further away from the grow light?). That said, I thought check that I don't have any kind of infection on the plant.

[Ray]

Natural

[SADE2020]

Natural Spots:
Evenly distributed across the leaf.
Do not change significantly over time.
No visible damage to the surrounding leaf tissue.
The plant appears otherwise healthy and vigorous.