Platelet-rich plasma (abbreviation: PRP) is blood plasma that has been enriched with platelets. As a concentrated source of autologous platelets, PRP contains several different growth factors and other cytokines that can stimulate healing of soft tissue. Platelet-rich plasma therapy is an old therapy and used extensively in specialities of dermatology, orthopedics and dentistry. Platelet rich plasma therapy utilizes growth factors present in alpha granules of platelets in an autologous manner.
Main indications in dermatology for PRP are androgenetic alopecia, wound healing, face rejuvenation etc. For preparation of PRP, various protocols are used and no standard protocol exists but main principles essentially involve concentrating platlets in a concentration of 3–5 times the physiological value and then injecting this concentrated plasma in the tissue where healing or effect is desired.