What is best treatment for orange-peel skin on chin?

Fractional co2, rather than Fraxel, would be an excellent option to resurface the skin on the chin area. Best, Dr. Karamanoukian 

Chin muscle contractions usually is the creator to that orange peel effect. Because it is a result of a muscle movement, the treatment choice is Botox to relax the muscle. It works very well and is a simple procedure.Botox will take about 5 to 7 days to "kick in" and then you see if you need a little more.

The
wrinkles and dimples on the chin are frequently the result of muscle contraction
and can respond well to neuromodulators such as Botox, and possibly in combination
with filler. But an in person evaluation
is essential.See an experienced
cosmetic dermatologist or plastic surgeon to be evaluated and talk about your
options.

......sometimes laser is not the answer to all problems. What you have maybe dynamic- ie. made worse with muscle movement, and in this case only 6-8 units of Botox will fix this problem for 4 months. If its deep wrinkling and solar elastosis (sun damage) then laser resurfacing will be best. An assessment will be critical for the best outcomes. All the best Dr Davin Lim Laser and Cosmetic DermatologistBrisbane, Australiawestderm.com.au