What are some cost-effective treatments for managing hyperpigmentation?

I am someone who is worried because I have become too calm.

Brown or red marks remain wherever acne has gone, and they don't disappear as easily as I expected over time, so my overall skin tone seems dull.

I get more self-conscious when I'm barefaced.....

I am looking into dermatological procedures, but there are so many types that I'm not sure which one to get.

Rather than undergoing multiple expensive procedures, I am looking for a method that offers good value for money and allows for consistent care. I would appreciate recommendations for treatments that help improve pigmentation without being too expensive!

I am curious whether a single session is effective or if multiple sessions are necessary, and I would also like to know the appropriate treatment interval. Additionally, I am wondering if the pigmentation could actually darken after the procedure, and if there are any good aftercare methods I can follow up with.