Dermaroller/Dermastamp - Am I Being Unrealistic to Expect Scar Improvement 7 Weeks After One Treatement?

7 weeks ago, I had a derma roller (1.5mm) and stamp (2.0mm) treatment - for rejuvination and about 5 isolated mild-moderate atrophic scars on my cheeks (acne + 1 mole removal). Overall my skin feels great! However, even though I was told that results take time, I can't help but feel disappointed that I haven't seen any improvement in the scarring. Am I too impatient? Is it reasonable to hope to see improvement after my 2nd or 3rd treatment?

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