medical Definition of allergic contact dermatitis
: an allergic response following direct contact of an allergen (such as latex, nickel, or poison ivy) with the skin that is typically marked by an itchy red rash often accompanied by swelling and watery blisters
Note:
Symptoms of allergic contact dermatitis usually appear hours or days following direct contact with the allergen.
—abbreviation ACD
— compare irritant contact dermatitis 
