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Excision After Derma Roller?

I did 3 dermarolling treatments but i dont think this will give me any improvement and i am considering excision. I think i am good healer judging on my cut scar on leg (fine white line). But dermarolling part is concerning me. It is supposed to promote collagen growth and hypertrophic scars are caused by over producing collagen, so will those scars when get excised produce ugly hypertrophic scar? How much should i wait after doing dermaroling, and doing excision?

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