Several acne products containing benzene have been recalled due to possible benzene contamination, the Food and Drug Administration (FDA) said this week.

The agency announced that after concerns were raised about levels of benzene in products containing benzoyl peroxide, they tested 95 acne products with the ingredient. While most had “undetectable or extremely low levels of benzene,” six products showed “elevated levels” of benzene.

Elevated levels of benzene were detected in seven acne products distributed to national retailers. Here's what the recall means.