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Contact dermatitis is inflammation of the skin caused by contact with a substance that causes an allergic reaction. Or it can occur from contact with a substance that irritates the skin. A minor case of contact dermatitis may cause mild redness of the skin or a rash of small red bumps, while a more severe reaction may cause swelling, redness, and larger blisters.
A rash usually starts about 48 hours after exposure to the irritating substance. Common causes of contact dermatitis include:
The location of the rash may provide a clue about the cause.
Current as of: March 20, 2023
Author: Healthwise Staff
Clinical Review Board
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