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Are the effects of acne scar treatments/collagen remodeling permanent?

I am about to start treating textural scarring, predominantly rolling , left from acne through UltraPulse, subcision, and filler (if needed). I was wondering whether the collagen remodeling from CO2 or other lasers for acne scarring is permanent? In other words, will I need to come in for "touch ups" every year or so or will the effects of treatment be permanent? I understand that certain fillers may require touch ups and I am going in with realistic expectations. Thank you!

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