What kind of care should be done on a daily basis for skin with pigmentation on the cheeks?

As I entered my 40s, I became more interested in skincare, but lately I've been worried about my skin tone.

There is a part on my cheeks that looks particularly dark, so it bothers me every time I apply makeup.

At first, I thought they were just blemishes, but after looking it up, I found out they could be melasma or other forms of pigmentation, so I became curious about what kind of care is needed.

I am looking into Pico Toning or whitening treatments at Maypure, but before getting the procedure, I would like to know the proper way to care for my skin on a daily basis.

I've heard that UV protection is important for pigmented skin, so I'm wondering if I need to be careful to apply sunscreen even indoors.

I would also like to know if it is safe to receive laser treatment while using whitening cosmetics, and if there are any ingredients I should avoid before and after the procedure.

I've also seen that skin irritation can actually worsen the discoloration, so I'm a little worried.

Since I have a job, I spend a lot of time outside, so it is not easy to take meticulous care of my skin.

If you are like me and concerned about both localized discoloration and overall skin tone, what kind of care should I start with?

I would like to consult on whitening care methods suitable for my skin condition.