The FDA tested 95 products containing benzoyl peroxide, an ingredient widely used to treat acne that can form benzene as a byproduct. It found that six products could have more benzene than usual.

This week saw four large-scale recalls over a range of issues, from chemical concerns to foreign material contamination.

Posay, and Proactiv recalled benzoyl peroxide products that may contain elevated levels of a chemical linked to cancer.