i used to have that problem in high school. what worked for me is the proactiv body wash with salicylic acid. it came in a pump back then but when i went to look for some for my husband last week it didnt anymore. it worked really well, and it has bead exfoliator things in it. you can even use it on ur face once a week for a deep clean. i would use it as a body wash and then use it directly on my back at least twice a week back then for some direct cleaning. try it
it's about $21 for 8 ounces so i didnt think it was too bad.
when i used proactiv on my face i noticed that it made my face paler than the rest of my body like what you were talking about. i think it's because of the benzoyl peroxide. now i use clinique and they use salicylic acid as their acne ingredient and it doesn't make my face paler, but my face is still a little paler than the rest of me because of the proactiv in the past =/
hope this helped!