What is the reason for the swelling of the blood vessels on the penis?

Varicocele is mainly caused

by venous valve insufficiency, venous return disorders and other reasons, patients can appear varicose veins like earthworms, a group or nodular, so the blood vessels on the penis are bulging may be caused by varicocele.

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, phlebitis

phlebitis is caused by surgery, varicose veins, obesity and other reasons, patients can appear around the veins skin swelling, pain and other phenomena, so the blood vessels on the penis are bulging may be caused by phlebitis.