Allergic contact dermatitis occurs when the skin comes into direct contact with an irritating substance, known as a primary irritant. This can trigger a rash, itching, blisters, and a burning sensation. Symptoms may appear immediately or after several hours and can last for days or even weeks.

Common triggers include cosmetics, hair dyes, fragrances, laundry detergents, nickel, and latex. Treatment focuses on avoiding known allergens and using soothing or anti-inflammatory treatments to relieve symptoms.