Trypophobia is so new among the list of phobias, it's not really recognized yet. The term was coined in 2005, likely by an internet forums user, to describe fear of irregular patterns or clusters of small holes or bumps. Lotus seed heads and the disgusting egg carriage methods by some tropical frogs are prime examples of things that trigger this fear.
What few scientists have looked into this illness think that trypophobia is based on biological revulsion. They consider the reaction to come from a primitive part of the brain which identifies danger. Others think that these images might have close association with infectious disease like leprosy and measles, or even parasites. Whatever the case, the images are disgusting – reader, beware!