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The good news: You're not alone, and you're not crazy. Up to 16 percent of people experience this fear, with slightly more females (18 percent to males' 11 percent) admitting a fear of "clustered" holes. According to a new study published in
Psychological Science
there may be an ancient evolutionary part of the brain telling people that they are looking at a poisonous animal when they see circular patches or spots, says researcher, Geoff Cole. In general, "clusters" are a trypophobe's worst nightmare.