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Dear customer, could you please clarify your consultation in order to answer it as soon as possible.

Swelling in the penis after masturbation:
This condition is called Lymphocele. This is a hard swelling that suddenly appears on the shaft of the penis after sex or masturbation. It happens when the lymph channels in your penis are temporarily blocked. Lymph is a clear fluid that forms part of the body's immune system. The swelling should soon subside and will not cause any permanent problems.

Recommendation:
It's recommended to visit urologist for further assessment of your condition.