On either side of the penis is corpus cavernosum, a sponge-like tube with tiny blood vessels. Each corpora cavernose is surrounded by elastic tissue known as tunica albuginea, which stretches during an erection so blood can flow into the tunica albuginea. As the chambers fill, the penis grows and forms an erection. If you have scar tissue under the skin, that area will not stretch during an erection; therefore, the penis will bend or curve, which can be painful.

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