Does melasma treatment get finished in just one session?

hello.

I developed melasma on my cheekbones because I didn't take good care of my face while pregnant.

At first, I didn't even know this was melasma.

I used to apply just one layer of sunscreen when leaving for work early in the morning and go all day without reapplying it,

I saw something that looked like a dot on my skin, and it turned out to be a freckle.

I am much more serious about sunscreen now than I was back then, so I apply it diligently.

I feel like my freckles become more distinct after engaging in outdoor activities on hot days.

I became interested in melasma treatment because of these concerns of mine.

Do I only need to receive melasma treatment once?

Or is multiple sessions required, like mole removal?

I think I would be highly satisfied if I received melasma treatment because my skin would look clearer.

I am also curious about the cost.