Electrolysis involves the insertion of a very thin needle (about the same diameter as a hair) into the hair follicle. As the hair follicle is a natural opening in the skin the insertion of the needle is not usually felt.
The root of each hair is cauterized by passing a current through the needle. This proven method of hair removal can be safely used for both the face and the body.
The amount of treatment needed to achieve permanent hair removal will vary from person to person.