Peels combined with creams and SPF
Wow, 25% TCA is way too strong, video below shows a SAFE but conservative concentration. You do need to combine TCA with HQ creams and lots of SPF to reduce PIH. Skin darkening can also be treated with Pico lasers and Q switch lasers, once again combined with prescription creams. All the best, Dr Davin Lim. Brisbane. Australia.
Post Inflammatory Hyperpigmentation -- Skin Lightening, Light Peels, microsecond YAG
I suggest you see an expert , a combination approach is typically needed for improvement. Best, Dr. emer.