As a dermatologist I can only tell users to do VERY CAREFUL not to pass on your moles which can be dangerous Long Term. They must be protected with such stickers Not to believe that you will have a definitive effect on hair growth but just suspensive with this kind of device You can have paradoxical effects of regrowth on the face that is seen pushing the hair or you do not have (cheekbones, neck). It should also be very careful with darker skin or tanned for not brand depigmentation giving skin look "zebra" Handle with care for neophytes !!!!!