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 Lanolin, used in many moisturizers to soften skin, can cause allergic reactions, as can common preservatives that extend a product’s shelf life, like parabens and quaternium-15. “It’s best to always use fragrance-free products [if you have sensitive skin],” says Hammerman. Also, avoid formaldehyde that can be found in nail polish and perfumes that will irritate skin. (A good way to know if you’re sensitive to ingredients in a product is to test it on your forearm by applying and leaving it on for 24 hours—if there’s no redness, itching, or blistering in that time frame, it’s safe.) Non-aggravating cleansers can be especially difficult for truly sensitive skin types to find. Hammerman recommends Dove Sensitive Skin Beauty Bar ($7 for six, walmart.com) and Dove Sensitive Skin Body Wash ($6, walmart.com).