What is this on my Royal Gramma?

[HammyReef]

Hello everyone,

I was just wondering if you could help me identify if my Royal Gramma has something wrong with it. It has a white patch in its side that looks to me like a scrape but I’m not sure. He likes to cram himself into tight holes in the rock work. My two clowns and Tail spot Blenny have no white patches. He seems to be acting normal and eats fine.

 

[gentlefish]

Looks indeed like a mechanical injury. To be sure: any new additions-water from other tanks that was not QTd? Currently I would observe. It is unlikely to progress into a wound infection requiring antibiotics, but please keep an eye on it. Btw I leave some night light on for orientation.

 

[Firthy13]

Yep I agree. Definitely just a scratch from wriggling through a hole in the rock worth that was probably too small. Mine does it all the time after a big feed. Gets so fat he can't fit in to the hole he lives in.