What Causes A Boil Inside The Vagina After An Abortion?

Hello Doctor, I am 38years old house wife with a daughter, recently like last month I had an abortion. Few days back I came to know that I have boil on one of my right side inside vagina wall. I went to see doc, she removed the pus it seems, I don't know how much. Am on antibiotic. I just like to what is the reason I got it, I am perfectly healthy. In April, have done the blood sugar, normal.