This advice given from a general practitioner. In order to shrink cystic acne overnight, dab on some prescription strength corticosteroid (some use betamethasone valerate 0.1% on the middle portion of thelesion then cover with an occlusive material (like a band aid circular sterile spots). Leave it on overnight, and you will wake up to a smaller pimple. According to this doctor, it works almost better than the corticosteroid injection.

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