Melasma treatment effectiveness, is it possible to distance yourself from the pigmentation in the mirror?

When I look in the mirror after applying makeup, the pigmentation scattered here and there catches my eye before my skin tone. Even when I cover it with concealer, it stands out under the lights, so I am looking into melasma treatment. Does the effectiveness of melasma treatment vary significantly depending on the depth of the pigmentation or my skin condition? People around me talk about laser treatment, but I’ve heard that I need to get an accurate diagnosis first to properly assess its effectiveness. I am also curious if treatment methods differ depending on the type of pigmentation, even if they look similar on the surface. I would like to know how long it typically takes to see results from melasma treatment, and how the intervals are determined if multiple treatments are required. Since my skin is quite sensitive, I am worried about redness or the pigmentation darkening after the procedure. Besides sun protection, are there any other care steps I should take to maintain the long-term effects of the treatment? Rather than trying to solve all my concerns at once, I want to find a method that suits my skin. I would appreciate it if those who have received treatment could share the process they went through and the key points to check during a consultation.