black bugs on rhynchostylis with yellow spot

[honolulukid]

I have these tiny round black bugs on my rhynchostylis - they come out whenever i water the plant. I can't even get a picture they're so teeny, less than a millimeter. they're perfectly round and black, and i can't see legs or discernable head but i know they're insects because they move around pretty quick when i poke them. Here's a pic of the plant leaf. I thought the yellowing may have been sunburn but it's been in a shadier spot for over a month now and the spot's been getting bigger.

I looked a lot of the other posts and the bugs don't seem to be ants, mites, thrips, scale, aphids or anything else common. Any help is appreciated.