How should I manage melasma to be effective?

A few days ago, I was so shocked when I saw something on my jawline that looked like a freckle or an age spot.

I diligently applied sunscreen every day, but it grew to the size of a fingernail. I really didn't know until now.

I only paid attention to what was on both cheeks, but now I need to pay close attention to it.

Lately, I've been seeing a lot of ads for dark spot masks whenever I access my phone or computer. It's really fascinating; when I apply the mask and wait a certain amount of time before peeling it off, the dark spots and blemishes stick to the mask and come off, leaving my skin looking as fair and clear as peeled eggshells.

After seeing it a few times, I felt like giving it a try. I looked up and read the reviews, but they turned out to be reviews written in exchange for a commission.

I'm curious about genuine reviews. For those who have tried the dark spot mask, what was your experience like? Please also recommend some good products for managing dark spots.