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I sort of see the spot your talking about but it's not clear enough for a accurate diagnosis. Does the mouth look deformed at all, any skin missing, or other deformities? What are the current water parameters at? Any chance for a closer picture of the affected area?
Water peramiters are normal doesn't look like a deformity looks like there is something stuck in his mouth and everytime I try and get a closer pic he moves
I'm sorry I can't be more help but without a clearer picture it's hard to say, I would perform small daily water changes and monitor the area. If it is a disease without indenification I can't recommend a treatment.