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Is the type of hand piece used during Fraxel 1540 for rejuvenation relevent?

1540 Fraxel . Does the hand piece contribute to the success at all? Two days ago I had a treatment. The hand piece was what looked like a microphone with a flat top. When administered I experienced what felt like (through the anesthetic) two points of 'zapping'. At the conclusion, patches were left unzapped. Two things - Judging by my recovery, the hand piece used, appears to be less invasive. Is the hand piece relevant? Should the operator have left some skin 'unstamped' in the way she did?

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