A lot of the time, the slime coat comes off the tips of the fins so that could be why it's only where the fin rot was. Usually what it looks like is white stringy stuff coming off the fins and sometimes the body but the fish otherwise looks and acts healthy. It often happens the most after a fish has been in medication or aquarium salt.
If the white stringy things continue but the fins are healing and you no longer need to use the Maracyn Two, then we may consider a so-called anti-fungal medication. I say so-called because all of the diseases we think are fish fungus are actually bacteria. o.O A med with acriflavine would be best, such as Fungus Cure.