About-Contact dermatitis also called contact eczema is a red, itchy skin rash caused by direct contact with chemicals or physical substances that cause an allergic or irritant reaction.
There are 2 types of contact dermatitis Allergic contact dermatitis- This occurs when skin, which has become sensitive to a certain substance (allergen), comes in contact with that substance again. Irritant contact dermatitis- This occurs when the skin is repeatedly exposed to a mild irritant like detergent or solvents over a prolonged period.