A member asked:

How can one develop an allergy to nickel?

A doctor has provided 1 answer
Dr. Neil Kao answered

Type 4 immune diseas: We don't know why some people develop this type 4 immune disease. The formal name is delayed hypersensitivity. This is commonly called a rash from poison ivy or nickel. The disease process is the same. Only the cause is different. Certain compounds we are exposed to triggers a reaction by the immune system.

Answered 4/4/2016

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