There are a lot of hives all over the front and back of my body.

Since a few days ago, I started developing hives on my torso, and they have spread extensively both front and back. They have appeared so much that I can't count up to my neck and upper buttocks. However, my legs and face are fine. The areas with hives are itchy and seem to be spreading, which is scary. I think I should visit the hospital tomorrow.ㅜㅜ