Like all other metal allergic reactions, nickel alergy is also one of the most common types of allergic contact dermatitis. Nickel allergy generally activates when the skin comes in direct contact with nickel, for instance while using coins or various jewelleries.

It is found that most people exhibit nickel allergic reactions after extended contact with the metal. Body piercing is typically considered as the most sensitized act of aggravating the nickel allergic reactions.

This is because the nickel seeps into the blood streams and start reacting. Once the allergic reaction to nickel is developed, it is quite troublesome to prevent the symptoms as techniques like desensitization of alergy shots are least effective. Thus averting nickel contact is advisable. The other way out is buying the kits that tests products for nickel content before using the metal elements.