I'm a 17 year old boy living in pakistan, I have two problems, firstly I'm 5 feet 11.5 inches and I weigh 62 kilograms, how do I gain more weight? Secondly, my acne does not go away, and when it does, my acne scars which are on my face for four years are really unpleasant to look at, how do I stop acne and make these scars go away forever? Thank you.