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I'm not sure if that's it. From what I've read it seems like sclerosing lymphangitis or possibly cancer, though I've never heard of a tumor that could vanish at certain times. Now it won't go away...

Ok, so I'm 22 and for the last month or so I've had bumps on the top of the shaft under the head. They're only on the left side, only show up when I have an erection (not all the time) and go away...