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Irritant contact dermatitis. Irritant contact dermatitis occurs when your skin comes into direct contact with a substance that damages the outer layer of your skin, causing redness, itching, and a burning or stinging sensation.
When some substances come into contact with skin, they may cause a rash called contact dermatitis. Some of these reactions are the result of an allergic reaction that involves the immune system, but many are the result of a non-allergic, or irritant, reaction.