Skin testing is a basic technique to determine the body's response to allergens to detect allergic reactions. Currently, there are a number of skin tests commonly used to assess allergies such as prick testing, intradermal testing and patch testing.

Nickel allergy is considered one of the common causes of allergic contact dermatitis. The sign of nickel allergy is the appearance of eczematous lesions on the skin that has come into contact with objects containing nickel. To diagnose, the doctor will rely on clinical symptoms to indicate the skin patch test.