@Colu thank you so much. I know - it’s unusual and I can’t find anything:( There is another pleco and other fish in the tank and they look fine. I have quarantined and will start a fungus/bacteria treatment. He’s really a beautiful big guy! I’m so worried about him!
My pleco is about 4 years old and is fairly large, healthy, and active. About two months ago I noticed a small orange spot on his underside and now it is growing. Just worried and can’t find anything online that looks similar. Any suggestion?