All forms of acne treatment can take a while to have an effect, and in some cases can cause acne to flair before it gets better. If you don't see any improvements in about a month or so, i would go back and see your dermatologist and see what they recommend.

For back acne I would highly recommend Dr. Bronner's Magic Liquid Soap. I personally use the lavender version, but there is also a tea tree version which might be beneficial for breakouts. It's also natural and organic so it's a gentler option that resorting to chemicals straight away.

1. Shower 3 times a day. Morning after school before bed
2. Some body acne spray
3. St Ives Blemish control body wash
4. If your skin dries, use cetaphil lotion.