- When 20cc or more was injected, the penile length increased by 2.4±1.3cm (70.6%) from the usual length. The overall length of the penis increased, with the distal circumference increasing by 3.8±1.0cm (53.2%) and the middle circumference increasing by 4.2±0.9cm (59.0%). %), the basal circumference increased by 3.7±1.2cm (50.8%).