I would just quarantine them while he's being treated. Parasites will die off if they can't find a host. I'd say a week of quarantine, and if you find that it is a parasite on his face, maybe treat the plants with a parasite medication.
I had a fish that looked like it had the same thing. She looked like she had a nose ring :shock: but it went away after a few days. I did daily aq salt and water changes and cleaned her container just to be on the safe side.
Never did find out exactly what it was...
I went ahead and bought something for parasites (Quick Cure).
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