Some waxes can affect the skin. I wasn't so quick to go in the store again, but about every 12 months later, I checked against eachother again since i love pieces. After 20 or 30 minutes the skin becomes more taut the actual hair shaft is more exposed making it simpler. http://www.cyrogen.com/__media__/js/netsoltrademark.php?d=cc.koreaapp.kr%2Fbbs%2Fboard.php%3Fbo_table%3Dfree%26wr_id%3D2665439