Melasma worsens after Cynosure

I had 5 sessions of Picosure laser and have been seeing my Melasma getting worse. Not only it becomes darker, I started getting more patches of it. The treatments were spaced four weeks apart. I asked my doctor if the setting was wrong but he told me there is only one setting for the machine. I am devastated. I paid a package price and have another 9 sessions. What should I do?