This article is from the Piercing FAQ, by Anne Greenblatt with numerous contributions by others.
by <RINGSOFUN@aol.com>
The piercing is actually in the aerola and deep behind the inverted
nipple. I pierced mine because they were inverted and was advised
that they may develop after piercing. They have done just that and
stick out nicely now. To further develop my nipples I re-pierced the
actual nipples after they developed. The second piercings were done
after about a year of the original piercings. It has now been 10 years
and I wear 4 ga rings in my large nipples and couldn't be happier with
the results! My nipples were never sensitive prior to piercing, but
now they are very sensitive!
 
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