What are some things to know about nipple piercing after care?

Piercing care. New piercings are usually cleaned twice a day. Do not twist jewelry / post. Saturate gauze w saline solution (pinch of sea salt in warm water), place on piercing & allow it to gently drip into the piercing. Don't recommend use of alcohol or Hydrogen Peroxide to clean piercings as they may cause the surrounding skin to dry out excessively.
Watch for infection. Any piercing can cause infection in the skin and sometimes in your blood. Allergy to the piercing material is another risk.