Allergic contact dermatitis actually refers to allergic contact dermatitis and is primarily used to distinguish irritant contact dermatitis. Irritant contact dermatitis is a reaction that occurs in all people who use or come in contact with such items, such as sulfuric acid, which can cause an irritant reaction in anyone who comes in contact with it. Allergic contact dermatitis, on the other hand, is a condition that causes allergic symptoms only when people who are allergic to such items come into contact with them. Therefore, allergic contact dermatitis occurs in people with allergies, such as those most commonly allergic to metals, especially nickel or cadmium. Erythema, papules, or even papules and blisters will appear on the limited contact area, accompanied by itching, and the lesions are consistent with the contact area. If re-exposed after a good treatment, the patient will also have a similar reaction.