The study titled "Fear of Holes," by Geoff G. Cole and Arnold J. Wilkins, found that up to 15% of people (18% of females and 11% of males) become viscerally upset after looking at images of clustered holes or bumps.
"Trypophobia is more akin to disgust than to fear," Wilkins told Business Insider in 2015. "The disgust is probably an overgeneralisation of a reaction to possible contaminants."
"The disgust arises from clusters of objects, and these objects are not necessarily holes, despite the name trypophobia," Wilkins continued.
Sources: Sage, Business Insider