TCA is trichloroacetic acid.
A Form of Resurfacing: The TCA (trichloroacetic acid) peel is one of the oldest forms of skin resurfacing. Skin resurfacing refers to use of an agent or device to remove layers of skin, thereby allowing newer, refreshed skin to grow in its place. Dermabrasion and lasers are also used for skin resurfacing. Chemical peels such as TCA and phenol have been around for many years and have a long track record of success