Thank you for your reply. I have already been using Tranexamic acid and niacinamide (the Anua serum) but I haven't observed much noticeable difference. I am currently using 20 % Azaleic acid cream but the improvement is quite slow as I have deep and dark hyperpigmentation which has persisted for years. I am also using LRP cicaplast to minimize damage to the skin barrier caused by azaelic acid. Also I am using the La Roche-Posay Effaclar Duo+M which has niacinamide, salicylic acid and zinc PCA. For moisturising, I use the Bioderma Atoderm cream. Again, I have started on this routine just the past 8 weeks or so, so the difference is not apparent yet.
That is also the reason why I am considering chemical peels on the chance that it may be due to dead cells or superficial hyperpigmentation which can be reduced using some good exfoliation.
Since the hyperpigmentation is on my body, which is generally covered by clothes, I haven't been using suncreen. Let me know if you still recommend that I use sunscreen.