When i had that prob in high school the doc told me to use any kinda body wash that is antibacterial...like Lever 2000.

Also, he told me that if you use conditioner, make sure to use the conditioner first and THEN use the body wash. Cuz conditioner that doesn't rinse off of your back will make it worse.

Oh and her told me that being out in the sun too much can aggrivate it for some people....