How to tell when a piercing is healing from infection ?

TMI !!!

but it started out with brown stuff oozing out so I knew it was infected and I talked to my doctor and did what they recommended, now there isn't like as much pain there and there's no more brown stuff it's just clear or yellowish. ? But I can't SEE any difference in the skin I just FEEL the difference. Still a keloid looking type of thing on the bottom of the belly button piercing so I don't know what to expect to know its healing.