How often is it appropriate to get Pico Toning to remove pigmentation?

Since returning from vacation, melasma and blemishes have flared up significantly on my cheekbones, making my skin look very messy. Even though I diligently apply whitening cosmetics, the existing pigmentation isn't fading, so I am considering seeking help from a dermatologist. I have heard that Pico Toning laser treatment is effective for pigmentation, so I am thinking of making an appointment. However, I have heard that this type of laser toning requires consistent treatment rather than just one or two sessions. I am curious about the appropriate frequency for Pico Toning: should I go once a week, or would going every two weeks be less strenuous on my skin? As a working professional, it is difficult to make time frequently, so I would appreciate advice from those who have experienced Pico Toning on what kind of schedule they typically followed.