I have done both. Messed with one with Bumblefoot for a year and left one with it totally alone. I had a terrible time getting it to go away. The one I kept trying to heal, hers kept getting infected and she was in pain. Ultimately, she passed during surgery trying to remove it. The one I left alone, hers never got infected and she never seemed to be bothered with it. It finally went away on it's own. I'm sure there are things to try like: antibiotics, removing the sore (it's kind of like a plug) and keeping it clean until it heals. Your photo looks like Bumblefoot to me. Good luck with whatever course you take.