U.S. health officials are asking retailers to pull a small number of acne creams from their store shelves after government testing found they contain slightly elevated levels of a chemical associated with cancer.

After recent U.S. Food and Drug Administration testing of acne products containing benzoyl peroxide, the agency determined that a small number of products should be recalled for possible benzene contamination,

Some acne treatments from brands including Walgreens, Proactiv and La-Roche Posay have been voluntarily recalled for containing elevated levels of the carcinogen benzene, the Food and Drug Administration announced Tuesday.