Can you spread psoriasis by scratching?

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Tags

1. #common
2. #another
3. #especially
4. #itchy
5. #curable
6. #immune
7. #treatable
8. #spread
9. #psoriasis
10. #untreated
11. #system
12. #disease
13. #cause
14. #scratching
15. #however
16. #affects