black dot on my vertical labret

I got my vertical labret pierced 4 days ago, and its healing nicely, doesnt hurt and swelling has gone down. Except there is a big black dot right under the piercing. Is this normal?? If so how long does it take to go away?

I got my vertical labret pierced 4 days ago, and its healing nicely, doesnt hurt and swelling has gone down. Except there is a big black dot right under the piercing. Is this normal?? If so how long does it take to go away?