Allergic-contact reaction can be referred to as allergic dermatitis, contact allergy, or contact dermatitis. Allergic dermatitis is a type of dermatitis (skin inflammation) caused by an allergic reaction to a substance. Contact allergy or contact dermatitis occurs when the skin comes into contact with an allergen or irritant. The symptoms of allergic contact dermatitis include redness, itching, and swelling of the skin. The most common causes of allergic contact dermatitis include metals, chemicals, hair dyes, and perfumes. It is important to avoid the allergen or irritant that causes the reaction to prevent further flare-ups. Treatment options include topical corticosteroids, emollients, and avoiding the allergen or irritant.