User blog comment:Xilinoc/Ch. 552 - The Fundamental Virulence/@comment-8669536-20131008145700/@comment-5398287-20131008210518

Scrolling up, Mohrpheus' explanation makes more sense: merely "wearing" Hollow Reishi doesn't do anything bad, but having traces of a Hollow enter your soul, like with Masaki and White, is dangerous.