That indicates the soon-to-be old skin is releasing. Two things that help the last of the shed process. 1.) Within the enclosure, have a rough surface like bark (on a hide) or a rock/stone (that has been sterilized..) 2.) mist the enclosure during this period to increase the humidity. The rough surface will help the snake intiate the shed by rubbing against it - the shed ideally starts by the slough originating at the snakes snout (top or bottom) and peeling or rolling off towards the tail. The snake will rub against that rough surface to get things going. If you don't have a rough surface, it make the start a bit of challenge. The increased humidity helps the whole process.
In the event you see the shed flaking or coming off its body but not its head, you can help out by putting some damp paper towels in a brown paper bag with the snake and closing it with a clothes pin overnight. The damp towels will moisten the shed and it should come off. If that doesn't work, while holding the snake, have it crawl through a course washcloth or towel that is wet with warm water. The course towel and the moisture will finish the job as long as the snake crawls through. Key point to a difficult shed (or any shed for that matter..) - check the end of its tail. Get all the old skin off or the tail might get nipped...
After a few sheds, you'll be able to know your snakes ability to shed on its own. I have several corns in a room together with same set up, same heat, same huidity and some shed fine every time on their own and some need help occasioanaly. Each one is different..
-----
2.3 Albino Nelsoni Milksnakes
0.1 Snow Corn
0.2 Sunglow Corns
1.1 Albino Motley Corns
3.3 '04 Albino Corn hatchlings
1.0 '02 Albino Stripe Corn
0.0.12 Sunglow/Moltey eggs simmering
bunch.bunch Bearded Dragons
Bunch.unch Crested Geckos
0.1 Great wife
2.0 Great boys
0.2 dogs (they're great too!!)
and Corey's Yellow Knee Tarantula "Fang"