A nipple piercing is a piercing, centere usually at the base of the nipple. It can be pierced at any angle but is usually done horizontally or, less often, vertically. It is also possible to place multiple piercings on top of one another. A nipple piercing typically takes 3-6 months to fully heal. Some people have noted that they can take up to a year and a half to fully heal. It's recommended that if stretching a nipple piercing, the piercee waits at least the healing time of their piercings between stretches.