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Illustration copyright 2000 by Nucleus Communications,
Inc. All rights reserved. http://www.nucleusinc.com
rashes are caused by contact with a substance that causes an allergic reaction
(contact dermatitis). The rash usually starts within 48 hours after a person is
exposed to the irritating substance, but it may not show up for several days. A
minor case of contact dermatitis may cause mild redness of the skin or a rash
of small red bumps. A more severe reaction may cause swelling, redness, and
Common causes of contact dermatitis
Contact dermatitis doesn't usually occur the first time you
are exposed to the irritating substance (allergen). After you have had a
reaction to the substance, a rash can occur in response to even very small
amounts of the substance.
August 19, 2013
William H. Blahd, Jr., MD, FACEP - Emergency Medicine & H. Michael O'Connor, MD - Emergency Medicine
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