There are several reasons why your penis could have a lump or lumps on it. It could be due a lymphocele, which is a hard swelling that suddenly appears on the shaft of the penis after sex or masturbation. It occurs because the lymphatic channels (which make up part of the lymphatic system along with lymph nodes or glands) in your penis have been temporarily blocked. The swelling should soon subside and will not cause any permanent problems.
Molluscum are small pinkish-white lumps about 1-5mm across. They can be found on the penis, as well as the lower abdomen near the pubic hair and the inner thigh. They are the result of a viral skin infection that is spread through skin-to-skin contact, so the infection can often be passed on during sex.
It is important not to scratch the lumps because they could become infected and cause scarring.
The condition is not serious and usually clears up in 12-18 months without treatment. If treatment is required, a GP or nurse can help remove the lumps by piercing them with a sterile needle and removing their contents.
To get it accurately diagnised you will have to get it looked at by a doctor.
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