I've had one on the back of my neck, right in the middle of my stomach, but more often than not, they appear on
the outside of my arms
, though never on
my hands, never on the inside of my arms, never on my legs, face, or back. Just the front of my upper torso and arms.. I didn't think dry skin showed up in such a specific way, and I thought it would be associated with a rash, which I never get. They appear and then disappear, typically in a week to a week in a half.