bitemark

I have two clowns maybe they did it but the little cherub is swimming fine and eating well. Should I be concerned???

Hello, I'm quite new here. It's been 2 months since I set up the aquarium. I have 3 percula clownfish (Nearly 3-4 cm) and 1 Cleaner Shrimp in 20 gallons tank. One of my percula got a strange white spot. Is it a bitemark from other perculas or any infection? I separated him from the aquarium...