Strange Bumps Hives

I got these bumps on the back of my ear, and when I strached them they spread all the way down my chest, and to the top part of my legs. Now I am not algeric to anything (that I know of ), and they went away when treated with Benadrel, but would reapper when the medication ran out. The bumps got rather large, they didn't really itch, and they would clump together. I never got them on my face, but they did cover the rest of my body. I only had them for four days. I have no idea what they were and would really love to know, thanks!!

If you no longer have them, it was most likely poison oak. If they reoccure, go to an emergency room where they will give you a shot of Benedryl and Prednisone which should clear it up for good.