What is the cause of Urticarial rash?

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Tags

1. #capillaries
2. #blood
3. #known
4. #called
5. #releases
6. #histamine
7. #causes
8. #accumulates
9. #protein
10. #nettle
11. #welts
12. #occurs
13. #released
14. #vessels
15. #weals
16. #fluid
17. #reaction
18. #urticaria
19. #allergic