This sounds like the beginnings of a keloid (raised scar tissue), and this is common with piercings in some people. For this, the best and easiest method is to use what is known as Tea Tree Oil, which can be bought in almost all pharmacies or Wal-Mart. It's an amazing little bottle of liquid that smells strongly like Pine Sol, and when diluted slightly with water, you can apply a good amount to the keloid 2 - 3 times a day with a clean Q-Tip. Don't overuse this solution, or it may do more harm to the piercing.
----That probably isnt a keloid. Its most likely hypertrophic scarring. Keloids can't be removed with TTO but HT scarring can. You can't dilute oil with water. You can use vitamin E oil or bio oil.
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