Open Heel Blister?

LosingMyMarbles

I wore a new pair of shoes while I was out today. I didn't notice any pain initially, but then got a sharp pain on the back of my heel. I had to finish grocery shopping, but when I took my shoe off, it had indeed blistered and was torn open with the skin flap most of the way off, no way to save it. Right now I have Neosporin on it with a gauze pad. I know there's a risk of infection, but is there anything I can I do for it? How can I stop it from happening again?

These are every day shoes, not running shoes: http://women.duluthtrading.com/store/product/womens-ariat-ridge-lace-shoes-42313.aspx

I'm a stay-at-home-mom so I don't have to wear shoes until it heals, but it's going to be cold taking the dogs out in sandals in 20 degree Chicago weather...