No, It’s not about sexually transmitted infections (STI).
A boil, is a localized infection deep in the skin. A boil generally starts as
a reddened, tender area. Over time, the area becomes firm and hard.
Eventually, the centre of the abscess softens and becomes filled with white
cells that the body sends to fight the infection. This collection of white
cells is known as pus. Finally, the pus "forms a head" and drains out through
the skin. Skin abscesses may occur anywhere on the body. They affect people
of all ages.