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Roseville, CA
A 20-year-old female asked:

i have noticed medium sized light purple blotches suddenly appearing with seemingly no cause and disappear/fade between a few minutes and an hour.

1 doctor answer1 doctor weighed in
Dr. Michael Fisher
Dermatology 32 years experience
Urticaria: When you have an allergic reaction to a substance, your body releases histamine and other chemicals into your bloodstream. This causes itching, swelling, and other symptoms. Hives are a common reaction, especially in people with other allergies such as hay fever.

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Last updated Mar 26, 2013
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