First of all, it's not a keloid, it's a hypertrophic scar. Commonly misused terminology.. But any piercing can be subject to hypertrophic scarring, whether it's due to placement or the type of jewelry. You can easily take care of them. Go to awfulmods on tumblr and they have a guide on how to take care of them using pretty easy techniques such as sea salt soaks and chamomile compresses.