i talked to the vet today and he said that it could possibly be from shedding when some of the skin doesnt come off and then it acts like a tourniquet and cuts off the blood flow to the tip of the tail

True, and in the best case scenario the tip will break and fall off on its own. However if dry gangrene has set in the infection will continue up the tail and enter the body killing the lizard.
I suggest you take a permanent marker such as a sharpie pen and draw a ring around the current top of the damage. If the damage moves past that point you will need to have that section of the tail amputated and the animal put on antibiotics. If at this stage the vet still tells you that there is nothing to worry about get another vet!

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Merlin,
What's Life Without A Little Magic!

I would take him to the vet so the vet could see exctally what's going on and they can help you with the little guy! Good luck and I hope everything works out ok!

Mark the tail as Merlin suggested and keep a close eye for any changes in the way the tail looks. I you see the area has increased contact your vet. You might want to record the date that you marked the tail so you can inform the vet if you need to regarding the length of time it took to see changes. Just a though.

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Colleen

ok done deal thanks for all your help