I need to clear my hyperpigmentation fast? (Photos)

Hi there, I've always had clear flawless skin up until recently when I had a bad breakout. I think this was due to stress as I have started my masters course recently. I have been prescribed antibiotics by my gp which has stopped breakouts however the marks the acne has left is pretty dark. I was supposed to get married in January, because I have lost my confidence I have called my wedding off :( Please advice me, should I try chemical peels? If so which one? Or microdermabrasion or dermarolling?

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