Trichloroacetic acid, which is used in some facial peels, is being looked at as a possible carcinogen by the International Agency for Research on Cancer, but the Environmental Protection Agency has found "no information on systemic toxicity following dermal exposure of humans." When used in dermal peels, skin exposure time is short, and the product causes coagulation of skin proteins, preventing it from reaching the blood, says Dr. William Coleman, editor in chief of the journal Dermatologic Surgery. "I continue to use TCA without hesitation," Coleman said.

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