Why is Deadpool's face messed up?

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Tags

1. #given
2. #cells
3. #factor
4. #suffered
5. #scarred
6. #beneath
7. #appearance
8. #unable
9. #after
10. #ability
11. #normal
12. #cancerous
13. #deadpool
14. #cancer
15. #heavily
16. #revealed
17. #healing
18. #giving