For years, I have been treating many conditions with TCA, some of them uncommon, with excellent results. Conditions wherein I use TCA peel. 1 Hyper pigmentation darkening of skin. For bringing out the natural color and texture of the skin 2 Hypertrophy, thickening of skin. 3 Scaly skins **The above three constitute what is known as Lichanification of skin, found in chronic dermatiti..