I'm unclear from the instructions with the lasercomb whether the recomendation is to use it over the entire head or just the affected areas which for me would be the top of the scalp. Obviously if you have thinning hair all over (like a typical female might have) then the entire head would be logical. But lets just say for a man (like me), who has only recession and thinning on top - should I still cover the entire head during treatment i.e. top, rear and sides, or just the top of the head. It seems a bit silly to apply to the back and sides when I know that hair will probably never thin.

If it should be applied to the entire head - whats the rationale for this approach?