You're not supposed to use the same product for over two years. If you do use a product for over two years, your facial skin usually becomes un-reactive to the product because you've used it so much it is no longer doing anything because though there is still acne there, the product isn't working because it can tell that it has already been applied several times and it won't work because it thinks it it doesn't need to. So, try using another product, maybe by two of the same product, then when you've run out of those two, try another two products if you still have acne, and then do that until you are clear faced or are just happy with your results.
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