The term trypophobia is believed to have been coined by a participant in an online forum in 2005.[1] The word is from the Greek: τρύπα, trýpa, meaning "hole" and φόβος, phóbos, meaning "fear".[5] Groups on social media sites such as Facebook and Instagram exist for self-identified trypophobics to share and discuss images that they say induce the reaction.[5][10]