Why are tattoos not allowed in Onsen?

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Tags

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2. #failure
3. #refuse
4. #cannot
5. #including
6. #becomes
7. #customers
8. #bathing
9. #baths
10. #japan
11. #typified
12. #written
13. #enter
14. #guidebooks
15. #tattoo
16. #ryokan
17. #facilities
18. #presence
19. #public
20. #using
21. #onsen