Contact dermatitis is inflammation of the skin caused by contact
with a substance that causes an allergic reaction. 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. Contact dermatitis does
not usually occur with the first exposure to the irritating
substance (allergen). Once a reaction to the substance occurs, a
rash can occur in response to even very small amounts of the
substance. eMedicineHealth Medical Reference from Healthwise To
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