Sorry it took a while for me to respond, I was looking for pictures and info on this.
This was what was on my Trimac.
View attachment 7656
View attachment 7657
Best way to describe it is that it looks like a white pimple. This one got fuzzy looking and then a second one appeared nearby. I medicated with a few things but after some research it looks to be Lympocystis. This is viral and there are no meds that really do anything about it. Clean water seems to be the best thing to do for it. Mine took months to settle down but now it looks okay, no raised spot or fuzzy looking, but small scar that is barely noticeable.
Helpful read:
https://aquariumscience.org/index.php/10-8-lymphocystis/