I don't listen to doctors regarding penis enlargement. They don't know anything. The only one I listen to is MOS and myself.
Also the myth about that your penis becomes tougher (harder to stretch) if you stretch it to hard is false. I don't understand why this myth still exists?
The only thing that will happen, is that your penis will grow super fast, and you need some rest days from time to time. I promote fast growth and nothing else.
There is no scar tissue happening.