Question regarding the recommended frequency of melasma skin boosters to resolve pigmentation concerns

I haven't been using proper sunscreen, so I have a lot of blemishes on my cheekbones. I am considering a melasma skin booster treatment. I heard that combining it with a toning laser is even better; what is the recommended number of sessions for a melasma skin booster? Will I notice a clearer skin tone after just three sessions? I have high hopes because the ingredients in the skin booster are said to help inhibit melanin production, but I am also curious if the results are well-maintained with consistent care. It seems like managing pigmentation is really difficult as I get older, so I would like to get back my bright skin with the help of a professional.