What caused rash of blistery irregular bordered spots surrounding neck? It started in soft area on left side of lower neck then spread in a +one inch band across front and back of neck to right side my neck. Some scattered spots upper torso over several weeks, then cleared up --itching was very mild. Blistery surface of spots eventually sluffed off leaving brownish spots where blisters had been. Since then I'm experiencing weakness in my back and a mild stiffness in the left side of neck muscles...related? What?