Trypophobia, phobia of small holes

Trypophobia, phobia of small holes - Lately a lot of people talk about trypophobia or phobia of small holes. But you know, in these conditions in the medical field does not actually exist. So what is it trypophobia?According to Urban Dictionary, is defined as the fear of trypophobia small hole or asymmetrical shape that makes a person feel itchy and tingling all over his body and feeling