Resorcinol is most common in hair dyes, also in shampoos/hair lotions, peels and in products used to treat acne, eczema and other dermatological issues.
WHAT TO LOOK FOR ON THE LABEL: Resorcinol, 1,3-benzenediol, resorcin, 1,3-dihydroxybenzene(m-hydroxybenze, m-dihydroxyphenol)