This article is from the Piercing FAQ, by Anne Greenblatt with numerous contributions by others.
4 to 6 months
The Christina is a vertical piercing made through the V-shaped
juncture of the mons and outer labia. Because of the thickness of the
tissue healing time can be lengthy. This piercing is highly
anatomy-dependent and should be performed only if a distinct ridge of
tissue is available to support the piercing. Often the area flattens
or changes shape with leg movements; placement and jewelry selection
should be determined accordingly. Because of the friction and
movement of the area, this piercing tends to migrate or reject.
Initial Jewelry: Barbells in 12 to 10 gauge and 9/16" to 5/8" in
length; the barbell should be 1/4" longer than the width of the
piercing. Christina piercings often swell considerably during the
first 4 to 6 weeks, and the barbell must be wide enough to accommodate
swelling. Because the piercing is usually at least 1/2" to 5/8" wide,
a ring of large enough in diameter will protrude uncomfortably against
clothing.
 
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