How To Treat Swelling In Toes?

I wore a pair of ill fitting shoes and afterwards I had a blister on my obth my smallest toes. In addition, the right side was swollen and hurt. Several days later, the swelling went down, there is no pain or numbness but the pockets are still bluish/black. I was afraid to drain the blisters but it has been almost 3 weeks now. My BS is good, and I continue to take my meds and insulin. However, I am a little afraid. Any suggestions.