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A member asked:
Red welts on my legs that appeared yesterday. painful to touch & have gotten bigger. what could this be? i haven't done anything out of the ordinary.
A doctor has provided 1 answer
Many possibilities: Possible causes: 1. Infection 2. Allergy to food, inhalants or drugs 3. Insect bites like bed bugs, spider bites 4. Autoimmunity 5. Hereditary cause of hives (rare) 6. Acquired deficiency of complement level (also rare).
Answered 9/3/2017
5.4k views
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