A small ridge or bump of scar tissue looking a bit like a pimple or small infection is probably a keloid. Whatever you do, do not pick at them as this can make them bigger. There are a few things you can try to reduce them (what works is different for everybody): put vitamin E or aspirin on them; see a dermatologist for recommended medical techniques; reduce the jewelry gauge (although this is not always an option). Generally, a keloid appears because of irritation, so your goal is to remove the irritation. Catching keloids early is important in stopping them.