I think I have pretty much the same thing, probably caused by pumping too hard. I went to a doctor/surgeon about it and he said something along the lines of that it's a harmless cyst or lymph. Mine is just one small hard lump/bump under the glans and it doesn't move around with the skin on the penis. The doctor said, since it's harmless there's no reason to surgically remove it unless I really want to or if it grows. He didn't think there was a way to make it go away quicker.