Hello, four days ago I was bitten by a spider. At first, it was like a pimple but right now is a huge hole on my calf with something white in it which looks horrible. The skin is insensible (necrosis). It's swelling, itching and it's red. The hole is open in the last two days, I call 999 yesterday and they told me that there's no place to be afraid of it because it will be okay by the time...? I'm all freaked out because of this view. I'm cleaning it every day and I'm waiting for an appointment with my doctor. It hurts a lot and the blood that came out of it was really dark red, almost like black. Please, help me!