It looks like a pimple. But what they pulled out, got bigger and bigger.
This video shows a botfly. Normally they lay their eggs underneath the skin of warm-blooded animals, like horses, so that the larvae can hatch and grow. This video shows the larva of a botfly that accidentally laid its eggs inside a human. There is nothing worse or more unnatural and afterwards I felt nauseous. That is why there is a little advisory here: NOT FOR THE WEAK OF HEART. P.S.: there are also botflies in the U.S.