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After 14 days the ear piercing should have healed. The presence of pus, swelling and pain indicate that an infection is likely present.
Treatment would involve removing the earing for a while (it may hurt as you remove it but it is necessary). The ear should be gently cleaned with an antiseptic, this should be done at least 2 to 3 times a day.
In addition to topical antibiotics, you may need to consult your doctor to determine whether oral antibiotics
Hope this helps