Trypophobia is a Phobia that makes people uncomfortable when seeing tiny holes in something such as skin,fruit vegetables etc.
In Simple Terms Trypophobia is an aversion to the sight of irregular patterns or clusters of small holes, or bump.
There's no exact known case for Trypophobia however it's believed to be an "unconscious reflex reaction" based on a biological revulsion.
I assume you think it's a skin condition because this is in body/skin category however as far I know there's no skin condition such as this and it's simply a Phobia or fear in people at seeing tiny holes in things and is more of a mental disorder.