Approximately 1 in 6 U. For medium facial peelsmany doctors use trichloroacetic acid TCA. Chances are you've experience a pimple or acne here Skin facial peel there. A local anesthetic in combination with mild or full sedation is typically used for deep chemical peels. For light and medium skin peels, no anesthetic or sedation is necessary, though patients may request a local anesthetic or mild sedation to alleviate discomfort. There are certain Skin facial peel which must be taken into consideration when contemplating a deep chemical peel.