I'm 13 currently and I've had acne since I was 10. I've heard that it may be a hereditary thing since my dad kind of had bad acne, but it cleared up for him and he's in his late 40's. I've tried different cremes and washes for my face AND my shoulders that both have acne. I went to my dermatologist once and all she gave me was Differin that made my skin worse. Help?