Can't melasma be removed with cosmetics?

As I get older, the thing I worry about the most is

They are freckles and blemishes. ㅠㅠ Fortunately, I don't have many wrinkles yet.

I haven't developed any, but my melasma is getting darker day by day.

I heard that applying Vitamin C is good, so I apply it at night.

I apply sunscreen and use a parasol during the day.

I wonder why it's getting darker ㅠㅠㅠ

Can't I use cosmetics?