Some questions for you:
Do you currently see any fuzziness on him at all?
Do the damaged areas of his fins currently have any discoloration (red, black, gray, darkened areas)?
What size is your tank?
How often do you do water changes, and what percentage do you change?
What's the water temperature?
Do you test ammonia, if so, what's the reading?
The best way to help fins to heal is to keep him in warm, clean water. If there's no current signs of rot or infection, that may be enough.
What water conditioner do you use? API Stress Coat contains aloe, which can help promote healing, and is soothing.
If it looks like there are discolored areas still, you may need to step up the treatment. But answer the above questions first, so that people have more info about what's going on.