Allergic contact dermatitis: A red, itchy, weepy reaction where the skin has come into contact with a substance that the immune system recognizes as foreign, such as poison ivy, poison oak or poison sumac or certain preservatives in creams and lotions. This type of reaction reflects a specific sensitivity or allergy to a specific substance. Also called allergic contact eczema.
Quick GuideEczema (Atopic Dermatitis) Causes, Symptoms, Treatment
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Last Editorial Review: 5/13/2016