This require no treatment.Just leave it alone.
It will clear on its own and completely disappear in a 2-3 week's time.
If it bursts the you could apply an anti-bacterial cream.Do not attempt to puncture it as it may lead to a secondary infection.
The color of the lesion may keep changing, but this is normal.The blood accumulated is getting broken down and eliminated from the body.
I punctured my blood clot and it kept on bleeding. Now there's an even bigger clot. How do I remove this?!
actually mine has been on my lip for over ten years,from a boyfriend who bit my lip. i recently hit it again and it spred an is now swollen even more blue