Melasma removal procedure

I have had melasma since I was young, so I am very worried about it. In the past, I could roughly cover it up with concealer, but now even when I apply makeup, the dullness remains, so I am considering getting a cosmetic procedure.

To be honest, I couldn't bring myself to make a decision right away because I heard that treating melasma is quite tricky. I've heard that laser toning and pico lasers are well-known, but I'm curious to know what the results were like for those who have actually received them. Will I see visible fading after just one or two sessions? Or do I need to approach this as a long-term, consistent treatment?

I had a consultation, and the dermatologist told me that it only disappears while I'm getting the treatment and comes back if I stop. Is that really true?