Hello!
PicoSure is a good choice for treatment of pigmentation including melasma. As you have rightfully pointed out, picosecond lasers like PicoSure, deliver a strong pulse of energy over a very short picosecond interval to scatter pigmentation without heating up the skin significantly.
In my opinion, PicoSure is the gold standard for treatment of facial pigmentation.
PicoSure treatments are generally more expensive that Q Switched laser treatments but the price varies depending on the extent of treatment done. You should see an experienced doctor for a consultation before deciding if PicoSure is for you.
Cheers!
Dr. Terence Tan