I would try keeping the skin covered with vasoline or cold cream and taking Clarkia , before investing in an expensive machine.
Also, beware where you buy them. I purchased a zapper on ebay in October and it still hasn't arrived. I began contacting the merchant two weeks after ordering, since it was only supposed to take 10 days to arrive. He said there was a hold up with parts and put me off six weeks. It never came. Within 60 days, I reported it to the merchant, ebay and pay pal, no response from any of them, other than to give me a tracking number for US post office, and they say they can't find any such package.