plasma pen is similar to carbon dioxide (CO2) laser beauty machine, it uses new generation of plasma micro district discharge technology with low temperature and high frequency , which is efficient capacity conversion material and chip control .when the needle touch the freckle skin,it produce plasma with high temperature as 2000 ºC immediately, and carbonize the spot freckle , then remove it.When the needle touch the freckle spot,it will produce a small flame,which is different from common flame.The micro vascular will be solidified quickly without bleeding during the treatment.Then it will form carbon scabs ,protect wound skin from infection.After about 1 week, scab will shed without scar.