Why do scratches puff up?

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Tags

1. #within
2. #usually
3. #medications
4. #dermatographia
5. #unknown
6. #redden
7. #infections
8. #similar
9. #these
10. #lightly
11. #marks
12. #penicillin
13. #upset
14. #hives
15. #scratch
16. #triggered
17. #raised
18. #people
19. #minutes
20. #emotional
21. #their
22. #wheal
23. #disappear
24. #cause
25. #scratches