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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 typically causes a pink or red itchy rash. Pinpointing the exact cause of contact dermatitis can be difficult. Allergic contact dermatitis is a skin allergy to something that touches the skin, even if only briefly. An example of allergic contact dermatitis is poison ivy.rritant contact dermatitis is caused when a harsh substance aggravates the skin by repeatedly contacting it. The most common example of irritant dermatitis is dry, damaged skin due to over-washing of the hands. In this case, the irritant is the water that is drying out and damaging the skin with repeated exposure.