I am a 50 y/o woman who was diagnosed with diabetes mellitus last year. My dog bit my thumbnail, his teeth went down directly into the lunula part of the nail That area has swollen to 2 to 3 times its size, the rest of the nail won't grow and there is a big black color that starts at the lunula to the tip of the nail. The original nail has since come off bit by bit. This happened last November. What should I do? Angela