How Effective is Dermaroller Compared to Excision for Deep Acne Scars?

I have deep Acne Scars and tried Microdermabrasion, but the acne scars are still very visible. I want to try excision but her clinic doesn't do excision, so she suggested dermaroller instead followed by a laser treatment, but says only 80% will be removed. Is dermaroller as effective as excision? Thank you.

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