If you have any bumps,Rashes or skin legions.
I tried using rare earth magnets w/ much success. Reverse polarity of magnets and try again if no sensation felt.
I even used it on old scars from surgery, some times surgeon's practicing malice, shall drop a tracking chip into the wound for bonus incentives from the eugenist community.
You may experience a tiny electro pluse.
Practice at your own risk….
Similar atrical:
https://criminallawyerregina.ca/is-it-legal-to-place-human-tracking-chip-implants-on-criminals/