I was just researching this last week. I have it too. I've had it for years to a fairly light degree, but the last three or four months, it started getting much worse. Strangely, about the time that I started the primal diet and cutting things out. I wondered if perhaps it getting worse wasn't some type of skin detox because it seems to be getting a little better now.
Some of what I read seemed to point towards a vitamin A deficiency. I haven't had time to do much more reading about it though. I too am hoping that it will get better with this lifestyle.