I had a habit of dry humping before. Then I noticed that there is a small swelling on my penis after sperm gets out. but it goes after the erection subsides. So I stopped this habit . but I do masturbation. A very small swelling is still on my penis. but after masturbation it gets little more bigger for some time and again goes back to the very small position after some time. there is no pain on that area. so please help me.