Contact dermatitis is usually caused by either an irritant or an allergen. An irritant is a substance that irritates the skin. An allergen is a substance that causes an allergic reaction. People may be exposed to certain substances for years and never have a problem, and then suddenly develop contact dermatitis.
Some common causes of contact dermatitis include:
- Metals, such as nickel (common in jewelry allergy)
- Cosmetics and toiletries
- Plants, such as poison ivy
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