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Could be anything, spots do not autimatically imply the presence of a parasite. I would do some google image searchs to see if you can help yourself ID it for sure. There is also the chance this is a simple <<bacterial problem>>.
If a parasite, it has a life cycle and will disappear from the fish to multiply and the appear on the fish again later, generally 7-10 days. If a bacterial issue, it will remain and just get larger.