About a month ago I got three cartilage piercings and a few days ago I noticed a keloid on each piercing. How do I reduce or get rid of them?

Keloid. To get rid off, you may need excision and repair and injection of steroid or 5fu (fluorouracil). See a plastic surgeon.
Steroid local appliy. May help to apply steroid locally 2 to 3 times daily. Do you have a history of keloid formation? If so these piercings my not be tolerated by your body.