Angelfish Sores

[fishdoc]

Hi all. I have 2 angelfish. Both are behaving normally but one has developed these sores. Any idea of what it is and what to treat them...
Tank is the standard cycled tank setup, no ammonia or nitrites and nitrates always <20ppm. Nobody else sick in the tank

 

[Colin_T]

What other fish are in the tank?
How long have you had the angelfish for?
How long has it had the sores?
Did they both appear at the same time?
What does the fish's poop look like?

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The one on the side could be a physical injury caused by swimming into something or something biting it. Or it could be bacterial.

The one on the belly could be split skin if the fish had a prolapse intestine (intestine sticks out its butt). It could also be bacterial if the fish didn't have a prolapse intestine.

Treatment could start with salt or a broad spectrum medication that treats bacteria and fungus, but need more information