Does anybody know how fast the Proactiv Refining mask works for 12 year olds?

Over the summer I ordered Proactiv and it worked for a while, Then my skin started breaking out even more and it got really bad. I still have the refining mask and I use it a little but I want to know how fast it should work on a 12 year old. I have reletively fair skin but I don't think that matters. Just if you could answer this question it would be greatly appreciated.