Allergen [al-ler-jen] What it is: A substance that causes an allergic reaction in the body. This reaction can be topical or systemic. VIDEOS RELATED TO THIS TERMDavid FowlerTap into the Wise & Powerful Part of YouInside the Julie K Nail Artelier LEARN MORE TERMSEXTENSION EDGERUSSIAN ALMONDVERTICAL OMBREUPPER ARCHNAIL PLATEMATTE TOP COATPARAFFINNAIL GLUESCRUBSPAINT PALETTEART BRUSHESDUST COLLECTORCOLORED ACRYLICCHEMICAL REACTIONEPONYCHIUMLINT-FREE WIPEFABRIC WRAPLUNULACARPAL TUNNEL SYNDROMEDAPPEN DISH PrevNext