First off I apologize for being graphic, last night I was masturbating and I ended up going for probably 6 hours or so. Anyway when I woke up this morning it looked as though my penis had changed shape like it had been flattened. It also feels like there is a growth or a tissue build up on one side under the foreskin. I don't know what it is or if it will go back to normal and I'm really worried.