Why did you go to your doctor, it's simply a matter of leaving a hot flannel on there until it softens up, then digging around with a needle or a scalpel and repeating this for however long it takes to heal up.
Did you by any chance jam it or injure it in any other way? (Slammed it in a door, ex.)Any visible cuts on your thumb?Anything looking like a bite from a spider or other bug?
Break out the cleaver, we can't let the infection spread.
This doesn't look infected. Is it oozing blood and pus?