Like injectable fillers, these platelet-rich plasma (PRP) treatments involve injections into your penis. First, you get a local and topical anesthetic to keep you comfortable. Then your doctor draws blood from your arm and spins it in a centrifuge to separate the red and white blood cells and concentrate the platelets, which are rich in growth factors. They then inject the platelets into several different areas of your penis.
A study published in 2019 that looked at various medical, traction, injection, prosthetic, and reconstructive procedures states that complications are “likely underreported.” The same study also says that the worst complications, although rare, can be “devastating.” These include penile fibrosis, sexual dysfunction, and even (in at least one case) death from pulmonary embolism. If you do decide to undergo a penis enlargement procedure, consider all the risks and follow all post-op instructions carefully.
Penis size is determined by hormone exposure and varies greatly from one individual to the next. The average length of a flaccid penis is between 3.4 and 3.7 inches, while the average length of an erect penis is between 5.1 and 5.7 inches. The average circumference of an erect penis is between 3.5 and 3.9 inches. Learn more about the average penis size.
A numbing cream, followed by an injected numbing agent, prevents pain. “Depending on the patient’s goals, a filler is chosen and then injected into the corpus cavernosum of the penis [two columns that contain most of the blood during an erection]. The filler is then worked through the penis, to achieve a uniform increase in length and girth,” says Cedar Grove, New Jersey, physician Dr. Muhammad Mirza in a RealSelf Q&A.

Lengthening the penis. The most common procedure is to cut the ligament that connects the penis to the pelvic bone. This allows a little more of the shaft -- on average less than an inch -- to become visible outside the body. It's not really lengthening the penis so much as revealing more of what's usually hidden. To prevent the ligament from reattaching, a guy would need weights or stretching devices daily for about six months.

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