I'd take it to the doctors...
Had one on my thumb as a kid playing in the garden pretty much prior to getting diagnosed.
Then.
Years later whilst traveling round India I had simalar on my index finger..? Puss was creeping up the side towards the knuckle.
In an attempt to control it, I took a lancet peirced & squeezed the infection out. Cleaning with bottled water & antiseptic.
The skin did dry & peel off & it healed up nicely...
How is your blood sugars running?