There are many factors that may affect your body's ability to heal a wound. The major factor affecting wound healing is your general health. If you are sick, run- down or over-worked, you will have a weakened immune system and will experience delayed healing and an increased chance of infection.
Smoking, poor diet, obesity and lack of exercise can also result in delayed healing. Any pressure on a piercing has the potential to cause aggravation, and, if continued for a long period, can result in inflammation. If you play contact sports or work in a job that requires manual labor, you should carefully consider whether a nipple or navel piercing is practical.
If you swim in public pools you have more chance of developing an infection, however you can cover the piercing with a waterproof bandage. The navel takes the longest to heal after being pierced. This is because movement and constrictive clothing knock it around, and it generally takes 3-4 months to heal.
Other piercings heal more ... more.
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