[Routine Help] If your routine consist of a cleanser and a moisturizer and you think one of then is breaking you out, how are supposed to know which one it is?

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My routine (testing only on forehead for 2 weeks)Am and pm: cerave foaming cleanser. cerave pm facial moisturizer.This routine can reduce the size of some old pimples but is also creating a couple of new ones. After i put on my moisturizer and let it absorb it does not feel greasy and is not very shiny either. however after about 4 hours my forehead becomes oily again. I think i don't react well to one of the products i am using but i don't know which one. How can i figure it out.
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Submitted by werttrew06