An allergic reaction (contact dermatitis) usually begins within hours to days after exposure to nickel. The reaction may last as long as 2 to 4 weeks. The reaction tends to occur only where your skin came into contact with nickel, but sometimes may appear in other places on your body. Nickel allergy signs and symptoms include: 
Rash or bumps on the skin
Itching, which may be severe
Redness or changes in skin color
Dry patches of skin that may resemble a burn
Blisters and draining fluid in severe cases
