I usually use 1-1/2" [about a 1/4th patch short side] strips around my key pain points.... I've found using more makes the whole area totally numb, or, dangerously so. But, IF one particular area is bad? I'll spead strips around the whole key area, concentrating more on the above the pain than below.
Very strange about the Lidoderm Rep not giving you an answer about key useful sites? Avoiding possible liability issues? Works against them in the long run...I'd think.
Here is a site I stumbled across recently and the neuro aspects as well as the others are very simple and clear compared to some....
http://www.apchute.com/index.htm
Love the mysterious body! Nothing is ever simple - 's to you especially! - j