It seems like my skin gets tanned every summer.

Hello. Strangely, my skin tone tends to be relatively bright in the winter, but I am concerned that my skin feels like it darkens by more than a shade overall only during the hot and sunny summer. I am stressed because my skin looks dull and my blemishes seem to deepen even without prolonged sun exposure. I have been consistently using sunscreen, but there has been no significant improvement. I am wondering if simple whitening treatments are sufficient in this case, or if procedures like laser treatments are necessary. I would also appreciate it if you could advise me on the types of treatments suitable for my skin condition, expected effects, recommended sessions, and potential side effects.