Okay after reading this I have to share this crazy experience that happened over a year ago while I was using Terramin mud packs to clear multiple lesions on the back of my neck.
I'd apply the clay then let it dry, but some areas stayed damp and made "visible" what was under the skin. This appeared to be a network that stretched up the back of my neck(probably all over too).
After the clay dried I'd wipe it off and keep putting more clay or sometimes just keep applying it over the top of the already dried clay in order to keep ~drawing out~ whatever was in there.
After awhile of this I felt a JOLT! It didn't really hurt but really startled me because I totally wasn't expecting something like that. It seemed like electrical but more like when you hit your funny bone. Never knew what to make of it.