Contact dermatitis happens when a substances touches your skin and causes an eczema reaction. Irritants that cause contact dermatitis are all around you. Some irritants are the chemicals found in common household items like detergents and varnishes. Some irritants may be chemicals you are exposed to at work. Even excess heat and sweating may irritate your skin and cause eczema. Once you have a rash, the treatment for irritant contact dermatitis treatment is the same as with any form of contact dermatitis. However, it will help you control and prevent your eczema if you are able to identify your irritant and avoid exposure to it.