I agree to leave it alone and monitor it. Fish do indeed manage to heal, if they are not stressed by any one of many things and assuming the water is in good shape. Water changes are not only the best preventative but often the best (and only necessary) cure.
I would not use any medication unless something specific develops. All additives to the tank water will get inside fish and are detrimental, even those intended to heal, so use of any additive/medication should be the last resort and then only if it is the best and safest treatment additive.
Fungus might appear, but again do not be quick to start adding this or that. I would want to know more about the other fish before suggesting any product, as they all are detrimental to some extent and there is no point in making things worse. Stress is the direct cause of 95% of fish disease.