I'm worried about my skin tone in the summer.

Hello. My skin tone is relatively bright in the winter, but I am concerned that my skin seems to darken by more than a shade overall during the hot and sunny summer. I am stressed because my skin looks dull and my blemishes seem to become darker even without prolonged sun exposure. I suspect that high temperatures have enlarged my pores, and although I have been consistently using sunscreen, I haven't seen any 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, the recommended number of sessions, and any potential side effects.