My son 19 had pimple problems for a long time.  I made CS for a health 
problem of mine and I figured if it was good for a lot of things...let him 
try it on his face and see if it would clear up.  He used CS on a cotton ball 
and wiped his face a few times a day.  In less than a week there was a 
remarkable difference in his face.  No more pimples.  The blackhead problem 
was greatly reduced as well.  I think in his case it was the surface bacteria 
that was causing his blackhead and pimple problem.  He did no really have too 
many "acne" outbreaks but his face would be pretty broken out at times.  Now 
since he's used it...and doesn't use any more he says...he does not 
experience the awful outbreaks. 
In my estimation I really think the CS solved my son's problems.  It would be 
worth a shot to try it.  I would recommend you make your own CS.  The 
strength I gave my son from my homemade batches were in the 20PPM to 30PPM 
range.
Good luck....hope it works for you!!
Linda