Is this a cut, or a parasite on my fish? Please help!!?

Time.flyz

New member
It started as a black dot, about a month or so ago, then it got white around it. then the black dot fell off, and it turned into just a cut like sore, it's pink.
it's been like that for a month, then today, there's a white dot on it.

it's on an angelfish.
I'm am fighting nitrate levels in the aquarium. could that be part of it?

Any tips or ideas help. Thanks.
 
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