The main contraindication is the presence of transplanted organs when drugs are prescribed to suppress one's own immunity, since all FSCs are immune modulators.
If a pacemaker is implanted, then it is forbidden to put the FSC on the body on the projection of the heart, the FSC discharges the batteries. You can do everything else.
FSCs can counteract anesthesia, if you are going to treat your teeth, leave FSCs in your purse away from you, immediately after the end of treatment, apply to the wound. If an operation is scheduled, it is recommended to stop using FSC three days in advance, then apply it over the bandage as soon as possible.
Do not take with you to the X-ray room, it may affect the quality of the image.