Originally Posted by ALB85
Salt soaks and Erythromycin I have a lot of good luck with bacterial infections. I would do it just to be safe.
The salt might be a good idea to help relieve stress and regenerate the slime coat, but I'd be cautious about dosing healthy fish with medication. There's no evidence of a bacterial infection so far, and the lesion seems to be healing, so for the time being I'd just let time and clean water do its magic. OP should still keep a close eye on it though, and administer the right medication if any signs of a problem should appear.