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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.
Contact dermatitis may cause mild redness of the skin or a rash of small red bumps. A more severe reaction may cause swelling, redness, and larger blisters.The location of the rash may give you a clue about the cause.n some cases a rash does not go away or the skin may become so irritated that medical care is needed. In adults and older children, rashes are often caused by contact with a substance that irritates the skin (contact dermatitis).