When I recieved a couple of young corns last year, one had a small piece (say 1/8"
of leftover shed attached to the tip of her tail. I put damp paper towel in her tupperware for a day and then it popped right off. There was an obvious tapering for the last little bit of her tail where the old skin had been. For the next couple of sheds, the skin stuck on that same spot and I had to remove it myself. Eventually though she started shedding normally and now there in only the slightest of indentation, but no discoloration. The tip in your pic sure looks to me like what she had going on only with the result that would have occured if I hadn't kept at it. Kind of like a leopard gecko who loses toes because his owner doesn't give him a humid hide.
Anyway, it's hard to tell for sure in the picture, but it doesn't look to me like their is old skin attached, more like the bit of tail where skin was getting stuck has already come off. Be sure to check it out on the next shed so that the problem doesn't get to be more than just a blemish.
-----
Black Rat Snake 0.1 (Patty)
Ball Pythons 1.1 (Morty & Mary)
Amazon Tree Boas 1.1 (Orville & Aeme)
Corn Snakes 2.2 (Bob, Sandy, Candy, and Tye)
Leopard Geckos 3.6 (Leo, Spaz, Spazzooka, Leiah, Han, Padme, Lonestar, Vespa, and Spot)
Central Painted Turtle 1.0 (Swim)
Red-Eared Slider 0.0.1 (Harold)
Mississippi Map Turtles 0.0.6
(Modelo, Tecate, Corona, Sol, XX, Bohemia)
Columbian Red-Tailed Boa 1.0 (James Jr.)
Central American Boa 1.0 (Steve)
Longnosed Snake 1.0 (Serano)
Bearded Dragons 2.0 (Irwin and Obie)
www.geocities.com/wink0083