Can the blemish treatment also reduce the recurrence of pigmentation?

My pigmentation had faded a little in the past, but as time passed, it feels like similar areas have become darker again, so I am looking into new treatments for blemishes.

I’ve heard a lot of people say that blemishes keep coming back even after they’re removed, so I’m wondering if aftercare is more important than the procedure itself.

Even if the blemish treatment is effective, can they reappear if exposed to UV rays or skin irritation repeatedly?

I am also curious if there is any specific care I must follow to reduce recurrence after receiving treatment for blemishes.

I would like to know how often I should reapply sunscreen after blemish treatment, and when I should start using whitening or exfoliating products. If possible, rather than just repeating treatments, I would like to maintain a clear skin tone for a long time by combining daily care.