The blister on my pinky toe has grown twice it's size?

I have to wear non-slip shoes at work and I'm getting blisters all over my feet. At first they appeared on my pinky toe, four days later the blister is twice the size of my pinky toe. It's very watery and squishy, but hurts really bad. I have to do a lot of working at work. What do I do? It hurts really bad! What would happen if the blister pops?