This is Dr Basu, experienced Internal Medicine Specialist.
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Can you upload picture for further evaluation?
This can be urticaria due to the degranulation of the mast cells and resultant histamine release.
Can be caused y the food allergies, cosmetics, or environmental allergies.
Comprehensive allergy testing is recommended.
Another possibility can be parasitic infection.
Stool tests and complete blood count with differential also recommended.
Rarely, this can be due to the liver disease, autoimmune disorder, or malignancies.
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