This is normal. The cartilage in our ears is very sensitive so it tends to be a little more tender. If you show any signs of
extreme swelling or yellowish to greenish discharge that doesnt smell that great, then it is probably infected. If that happens, see a doctor for some antibiotics.
Try not to sleep on it as much as possible, dont use that ear to talk on the phone..stay away from stuff like that. Also, dont play with it a lot. Rotate it ONCE when you clean it, otherwise dont touch it. When you rotate it, make sure your hands are clean with antibacterial soap as well. Make sure you leave this piercing in for at least 12 weeks, then you can change it to another earring.
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