Sunday nights can be slow around any forum. You should get some more replies today. In the mean time...
What is your:
Ammonia level -
Nitrite level -
Nitrate level -
?
What kind of substrate do you have there? It's hard to tell from the pic.
Any tank mates?
Any sharp objects in the tank he could have injured himself on?
What size is the tank?
When was your last PWC and how much?
What is your maintenance schedule?
Is there any discoloring or reddening on or around the barbel?
Is he displaying any other issues?
Answering these questions will help folks help you.
IME, the first step to healing is daily PWCs of about 50%. Lots of clean water goes a long way in the healing process.