Hard lumps can be felt on the penis, which can be caused by venous sinuses, penile sclerosis, sebaceous cysts, and scleroderma. 1. Venous sinus: it is a normal intra venous valve, in the state of penile erection the veins dilate, and hard lumps can be felt on the venous vessels. 2. Scleroderma: is a subfibrous lesion of the leukomalacia of the corpus cavernosum of the penis, which may lead to the appearance of single multiple plaques or hard nodules in the penis, and may also lead to hard bumps on the penis when palpated. 3. Sebaceous cysts: cystic structures formed when the ducts of the sebaceous glands of the hair follicles become blocked and the secretions of the glands cannot be discharged in a timely manner, which can also lead to hard lumps on the penis when touched. 4. Chancre: Stage 1 syphilis, caused by infection with syphilis, results in a hard chancre of the penis, which can also lead to hard bumps on the penis, most of which are accompanied by painless ulcers on the skin. There may be other reasons for the hard lumps on the penis, so you need to go to the hospital first to get checked out and get a clear picture of the cause of the problem and follow the doctor’s instructions.