I got prescribed doxycycline for 6 weeks?

I don't have acne really anymore, but once my doctor felt my cheeks she said she felt cysts so she prescribed me on doxycycline for 6 weeks and when I returned then maybe i'll be able to get the fraxel laser done. She also mentioned that I should get rid of the bacteria first so I won't have more acne marks coming through. I thought the lasers killed the bacteria altogether?? and is this laser right for me?

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