Hey guys

I suffer from only forhead acne and I was wondering how much benzoyl peroxide to use after week one.. i think my forhead has finished the stage where it gets irritated and dry and stuff..

Also I live in the Emirates where it's very very very hot and humid and stuff and I'm usually out when the sums out.. when I get in from school or wharever I'm usually sweaty so what I do is simply gently wash my face with water and pat dry it... now do I reapply anything?? And it what I'm doing correct and. Any other tips please..

Lastly I have scars on my forhead what can I do...