Fungus on my Toe

On my right big toe, I have a blister that I noticed a week ago.
I figured it was some sort of fungus or atheletes foot.
I went ahead and popped the blister and applied some over the counter treatment for fungus.
Today, I popped it and noticed some sort of jelly-like pus.
At first, it looked like clear jelly and then with the blood it turned red.
I am going to the doctor, but I wanted to ask if you could give me a cause or a diagnosis of what it can be.
Thank you