How to treat post-inflammatory hyperpigmentation due to TCA peel? (Photo)

I don't recommend applying TCA peels yourself, due to the risk of complications. Hyperpigmentation can be improved with a combination of lasers, Aerolase, microneedling/prp, skin lightening, peels, and skin care. Sun protection is essential. I recommend getting a formal evaluation with a cometic dermatologist. Best, Dr. Emer

Hyperpigmentation can be treated with a combination of laser (such as IPL) and products, including hydroquinone and Vitamin C.  It is critical to use a good, physical block sunscreen (such as Elta MD), even on cloudy days because UVA rays are not impacted by clouds.
I recommend not doing another TCA or microneedling at this point.  Wait until you get the pigment reduced.   You should have a consultation with a physician who specializes in aesthetic medicine.

First, protect the hyperpigmented area from the sun with vigilance by regular application of sunscreen.  Even small doses of UVA light exposure (present year-round) could make the problem worse or delay recovery.
Avoid attacking the problem with more procedures at this point.  Acutely, sometimes corticosteroid creams are used to treat any residual inflammation.  Bleaching agents with hydroquinone may also be helpful. 
See a dermatologist.  This can be a difficult and stubborn issue.

Further peels will worsen the situation. For now, time and sunscreen will be your best friend. Use HQ, or Lytrea, Meladerm can also help. Do not micro needle, do not do other peels. Another option is low dose QSL by a dermatologist- this laser either pico or nano can marginally improve the situation. Dr Davin Lim. Brisbane. Australia.