I tried piefed.blahaj but with the images being auto expanded by default there’s way too much questionable anime.

Not an expert, but is that potted plant a tropical by any chance?

I had something v similar if not the same pop up in a 5yo hot pepper plant. Turns out it was a sign of impending doom for that (and most any tropical) plant.

Check with a real botanist, but I would suggest re-potting it asap.