What's better: Injecting prp applying prp tropically along with dermapen?

I have a pock marks over my face which was very deep but after dermabrasion my scars is quite flatten but still it is visible. I want my scars to be more lighten to the point of invisibility . so wanted to know that , is injecting a prp and followed by dermarolling is a better option or simply (tropically) applying prp over the face followed by dermapen ?? Please reply

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