I had what appeared to be an insect bite on my hand between my pinky and ring fingers. After a couple days it grew into a pus-filled blister-like growth. Once it popped it began to ooze pus, and smaller growths developed beside it. It has not scabbed over and continues to ooze, and there are now two smaller bumps beside the original sore. What could this be and how can I treat it?