Medium peels generally produce more dramatic results than superficial peels, because they penetrate more deeply into the layers of the skin. Medium peels are usually performed using what is known as trichloroacetic acid, which may be used with Jessner's solution or glycolic acid to improve treatment results. Like superficial peels, treatment results depend on the concentration of trichloroacetic acid applied during the procedure. This is because solutions with a higher concentration penetrate more deeply into the skin. Although individuals with dark complexions are at an increased risk for skin discoloration, medium peels can be used successfully on individuals with fair and olive complexions. One of the most common types of chemical peels, medium peels are a safe, effective method of treating fine to moderate lines, pigmentation abnormalities, acne scars, and blotchiness of the skin.