What you do really depends on your fish keeping philosophy.
It is likely your fish has ich, and it is likely many fish in most systems also have ich. If the fish is stressed, or the water parameters are off then the ich can really take hold and become a lethal problem.
If you want to get rid of the ich, (as suggested previously) you have to take drastic actions to eradicate the ich from both the fish and the system. This includes leaving your tank fallow for 6-8 weeks, and treating your fish in a QT with either hyposalinity or copper. If you go this route, it would be absolutely silly not to quarantine your future additions as you worked hard to get rid of the stuff in the first place.
If the fish is eating well, and is not bullied by other fish it will probably be able to fight the ich to a manageable level just fine on its own. The ich is still in the system, and will probably continue to stay there for as long as you own the tank.
So it really depends on what your philosophy is, and how much effort you want to put into it. For the sake of a small damsel tank, I would just leave it be and continue to keep an eye on it. If it were a large system where you plan on putting thousands of dollars of sensitive fish into it, I would advise differently.
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