Sebaceous cysts on the penile body are retention cysts formed by obstruction of sebaceous gland excretion due to occlusion or narrowing of the sebaceous gland ducts in the penis, which is a benign lesion. The surface of sebaceous cysts is often slightly elevated, often adherent to the skin, round or oval, the capsule for the sebaceous secretion and broken sebaceous cells and contains a large number of cholesterol and cholesterol crystals, part of the visible calcification, with a bad smell. When combined with infection, there is pus in the sac. If you find sebaceous cysts on the body of the penis, you should go to the hospital in time, with the help of the doctor to carry out regular treatment to avoid further development of the condition.