Benzene, a known carcinogen, found in some popular acne products, lab says. Here's what to know.

A testing company says benzene, a chemical that is a known carcinogen, has been found in another commonly used product: topical acne treatments.

Valisure, a Connecticut-based company that operates an analytical laboratory, issued a citizen petition to the U.S. Food and Drug Administration, publicly released on Wednesday, saying it has found "high levels of benzene" in acne products containing benzoyl peroxide, including popular brands like Proactiv, Clearasil, PanOxyl and products from Estée Lauder's Clinique, Target, Walgreens and Walmart.

As part of the petition, the company requests that the FDA "recall and suspend sales of benzoyl peroxide from the US market."