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.
Dermal fat grafting (DFG) involves the extraction of a patch of skin from the patient's own body (usually the lower back, lower abdomen, or buttocks) along with a layer of fat. After the skin is removed from the penis, the extracted tissue is grafted in its place. Because the extracted skin is thicker, it will increase the circumference of the penis. By taking tissue from the patient's own body, the risk of rejection is low.
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.