I would talk to your mom about trying Proactive, I have used it and it works wonders.
I would second that. I used to have perfect skin in high school, then I turned 18 and the zits started. I tried everything possible. I went to the dermatologist and nothing seemed to work. Not only that but it became very expensive to visit him, then get the medicine. I've been using proactive and my skin has really cleared up.