Platelet Rich Plasma (PRP) is an autologous platelet and fibrin processing system, which extracts collagen stimulating plasma from your own blood. PRP will provide a gradual increase in volume by helping stimulate your body’s own collagen production. It can be injected into facial and neck lines or it can be applied topically after a fractional skin resurfacing procedure, to enhance the effects of the resurfacing. Selphyl is one brand of PRP.