Glow Fish Injured Itself

[xfallenfatex]

I have a yellow glow fish that has some how injured itself. It has a large hole right below its mouth and you can like see in it. The gills also have a red tint to them that they did not have before this. It stills eats as normal however it opens and closes its mouth constantly and it never used to do that.
Is there anything I can do to help it?
Thanks

 

[WILDER]

Size of tank in gallons or litres.
How many fish and which type.
Water stats in ammonia, nitrite, nitrate, and ph.

Do you have anything sharp in the tank.
Is he laboured breathing.
Any sign of flicking and rubbing.
Any excess mucas on the gills.

Is it possible to load a pic up of the sick fish.