Trichloroacetic acid (TCA) peel is a chemical skin-resurfacing treatment that works by applying a controlled acid solution to the skin, which penetrates the outer layers to dissolve dead skin cells, stimulate collagen production, and accelerate cellular turnover, effectively treating hyperpigmentation, fine lines, acne scars, and uneven skin texture as the damaged skin eventually peels away to reveal a smoother, clearer, and more youthful complexion underneath.