Contact Dermatitis is a skin condition that occurs when the skin comes into direct contact with an irritant or allergen. This can lead to redness, itching, and swelling. Common irritants include soaps, detergents, and certain metals like nickel. Allergic reactions can be triggered by substances such as poison ivy or fragrances in cosmetics. There are two main types of contact dermatitis: irritant and allergic. Irritant contact dermatitis happens when the skin is damaged by a substance, while allergic contact dermatitis occurs when the immune system reacts to an allergen. Treatment often involves avoiding the offending substance and using creams to soothe the skin.