In what type of peels does the coagulation of the protein in the skin turn the treated area white?

When discussing chemical peels, the coagulation of protein in the skin leading to a white appearance in the treated area is specifically associated with Jessner and TCA (trichloroacetic acid) peels. These types of peels penetrate deeper into the skin layers, resulting in a more significant alteration of the skin's structure, including the denaturation of proteins.

During Jessner and TCA peels, the acids involved create a chemical reaction that not only exfoliates the outer layer of dead skin but also affects the deeper skin layers. This coagulation manifests as a white frosting effect on the skin, which is a visual indicator of the depths that the peel has reached. This effect is often expected and may be desirable, as it signifies that the peel is performing as intended.

In contrast, glycolic acid peels, salicylic acid peels, and enzymatic peels typically do not produce this white coagulation effect. Glycolic acid peels primarily affect the uppermost layers of the skin, leading to rejuvenation without significant protein denaturation. Salicylic acid peels, while deeper than glycolic peels due to their lipid-solubility, also tend to have less of a coagulation effect and