How much should I expect to pay for melasma treatment?

Lately, the melasma around my cheekbones and cheeks seems to be getting darker, so I am looking into melasma treatment. In the past, I could cover it up to some extent with makeup, but recently, it shows through like streaks even when I apply foundation, so I wanted to try managing it properly. However, I heard that it is difficult to get rid of melasma all at once, so I would like to look into the cost beforehand.

I have looked into melasma treatments and read that the method and number of sessions can vary depending on skin condition and the depth of the melasma. I am wondering if these differences result in a significant difference in cost. If I have an initial consultation, would it be possible to receive an estimate of the approximate cost along with the number of necessary treatments?

I am also curious if there is a cost difference between paying per session and proceeding with multiple sessions together, as I need to receive consistent melasma treatment multiple times. Before starting treatment, I would like to receive a consultation on how long I should expect the overall duration to be, and what kind of cost I should keep in mind, including additional aftercare.