I have acne marks (PIH) on my face. Its mostly on my forehead, which makes it annoying. I dont have many marks on my cheeks, only like two or three. I'm just worried about the ones on my forehead. Theyre not scars fortunately, but theyre dark marks that take a long time to fade. I dont know what I could use to fade them. I'm only fifteen, so I dont have money to buy high end products. What could resolve my marks using drugstore products? Any recommendations? Thanks!