I have a cory that bloodied its barbel on some sharp gravel and wore it off.
I put it into a bare bottom tank. took about two months to heal.
Was quite a hard time for the fish, as it seems to use the barbels to stay upright on the floor.
It was permanently keeled over to one side and had a hard time getting to food fast enough.
All is better now.

Never medicated, just kept the water clean, and kept it away from abrasive surfaces.
You could always add some rooibos if you don't mind a little peachy copper tint to your water.
I am currently treating a sick female betta with dropsy and fin rot after she got an infection at the sight of a scale injury.
Yep stuff span out of control way too fast. I have tried everything. Methylene baths would clear the wounds, but they would be back the next morning.
Coloidal silver reduced infections but by night 5 of the treatment the infected sites were white again... it does say one may need a second course but she was developing issues with her swim bladder, and I wasn't going to chance a second round, bettas and cories are known to be sensitive. SO now we are back to Epsom baths and I added 4 bags of rooibos tea to her tank. The scale wound is gone and new scale grown back, fin seems to be growing back and there is only a few white filaments left around the fin. I might add another two bags. She seems to like it and hangs out on the side of the tank between the bags. It is really a great plant. It is antibacterial, anti-carcinogen, soothing. Heck, you can use it to treat sunburn. South African babies are raised on the stuff as it prevents colic. Over there you'd probably have to get it from a health food place. Just make sure it is plain organic rooibos (red bush).