A localized reaction that includes redness, itching, and burning where the skin has come into contact with an allergen (an allergy-causing substance) or with an irritant such as an acid, a cleaning agent or another chemical.

Also called allergic contact dermatitis, this is 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 or certain preservatives in creams and lotions.

A type of acute or chronic Skin reaction in which sensitivity is manifested by reactivity to materials or substances coming in contact with the Skin. It may involve allergic or non-allergic mechanisms [..]