Penis enlargement surgery is a procedure aimed at increasing the length or girth of the penis. There are two main types of procedures: 

1. Penile Lengthening: Involves cutting the suspensory ligament that attaches the penis to the pubic bone, which can give the appearance of a longer penis. 

2. Penile Girth Enhancement: Involves injecting fat, dermal fillers, or other materials to increase the width or thickness of the penis. Both procedures may require general or local anesthesia and have varying results.

These surgeries are primarily cosmetic and carry some risks, including scarring and changes in sensation.