###Human: I have hard lump under the penis shaft. Is it smegma? ###Assistant: Hi. I think the lumps that you able to feel are nothing but smegmoliths. These are nothing but concretions of smegma, if not cleaned for a long time. Are you able to retract your foreskin completely? If you cannot, then you may be having phimosis, which can be managed by circumcision. This will also prevent further accumulation of smegma. For further information consult a urologist online -->