Platelet-rich plasma, or PRP, is a substance that promotes healing when injected. It is created by isolating plasma from the blood and processing it. Plasma contains special proteins that support cell growth and help the blood to clot. The procedure draws blood from a vein in the patient's arm into a vial. The blood is then processed using a centrifuge machine. A small amount of the PRP is injected using a syringe and needle. The injection area is then cleansed and bandaged.