How Many Passes of Deep FX is Normal for Skin Tightening?

I would like information on Fractional Deep FX laser treatments. My doctor is recommending two passes with the laser. Is this normal procedure?

I am fair skinned, 57 year old woman. I have minimal wrinkles, but cystic acne and broken blood vessels. My doctor also said that the laser can tighten the skin in my neck and around my eyes. I am worried about overdoing it and ending up with red skin or burns.

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