[PSA]Propylene Glycol, also known as Propanediol, was named the American Contact Dermatis' Association's Allergen of the Year for 2018. (Read your labels. You might be extremely surprised.)

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https://journals.lww.com/dermatitis/Abstract/2018/01000/Propylene_Glycol_in_Contact_Dermatitis___A.3.aspx
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Submitted by veniceinperil2