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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.
In allergic contact dermatitis there is a skin reaction to something that has touched your skin at that site. Unlike most allergic reactions, the trigger is external rather than internal. Your initial exposure does not cause a rash. However, it sensitises your skin so that you will react to the next exposure.