The more severe cases of acne cover parts of the body as well as face and can pit the face so badly there is hardly any clear skin left.
In ten days you can reverse this, so most of the skin is beautifully clear. There are bacteria involved and skin oils of youth feed these bacteria. Acne has been extensively studied by scientists. Perhaps the true culprit was too big to be seen with a microscope or too small (antigen) to be recognized or just too unimaginable. I inevitably find Trichinella, one of the four common roundworms that infect humans.
Test yourself to Trichinella with the slide called "larvae in tissue." Search for it in your skin. It is generally believed to reside in muscles, especially the diaphragm, but in acne cases it is in the skin.
If you only have a NEORife, set it at 404.5 KHz and at neighboring numbers, extending 5 KHz on each side, to be sure to include all eggs and other molt stages. Or zap.