Why Does Crystal Meth Cause The Skin On The Scrotum

why does crystal meth cause the skin on the scrotum and penis get ready, burn, and dry out in white flacks. The only cure this is using is rubbing alcohol (which burns like crazy, then complete drying the area.
using. Also, my lips are always dry and peeling. I drink lots of water and poweraide zero and I'm smoking so I don;t believe it's because I'm dehydrated.