Contact dermatitis is a type of skin irritation or rash that occurs when the skin comes into contact with certain substances. The rash can be itchy, red, and swollen, and can range from mild to severe. There are two types of contact dermatitis: irritant and allergic. Irritant contact dermatitis occurs when the skin is exposed to a substance that is harsh or irritating to the skin. Common irritants include soap, detergents, solvents, acids, and alkalis. Allergic contact dermatitis occurs when the skin has an allergic reaction to a substance. This type of contact dermatitis is caused by an immune system response to a specific substance, such as nickel, fragrances, or preservatives.
