Any Idea When Acne Treatment Will Start To Work?

OK, so my dermatologist put me on this treatment for acne, and I've been using buy drugs without a prescription it for 4 days and so far I don't see too much of a difference. He prescribed me:
Doxycycline- which I take with breakfast in the morning
Benzaclin- which I put on in the morning
Differin- Which I put on before bed.
Any idea when I'll start to see a difference?

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