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Clean your piercing regularly for the first few weeks. Cleaning your piercing on a regular basis will help stimulate healing and prevent an infection. As a result, you should use a saline solution on your ears every day, and clean your piercing with soap as needed (once a day at most) for the 4-6 week healing period.
The entire ear can be destroyed in just a few days. This problem is devastating and fixing it requires some pretty complex surgery. Cartilage piercing is dangerous because it really doesn't take much at all to cause an infection. So my advice, buck the trends and don't get the cartilage pierced. Pierce the earlobe -- once, twice, or whatever your mother lets you do. But stay away from the upper ear.