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That doesn't look normal to me at all. Leopard geckos store fat in their tails, not their armpits, and especially not just one armpit. Whatever it is looks like it's not too serious though unless it gets much bigger. It could be a cyst or blister.
Edit: also notice her tail isn't even that fat, so any extra fat in her diet would be going straight to her tail regardless if they store it in their armpits.
Brock
Here is is a good read if you would like to learn a little about it. A quick goggle search will tell you the same thing.
http://www.lihs.org/files/caresheets/E_macularius.htm
I have also heard from Ron Tremper that is could be excess calcium. if it is "squishy" it is probably one of the two.
It is quite a normal occurrence even with geckos without that fat of a tail. I have over 150 leos currently and all sorts have it.
If it is hard or doesn't go away with cutting back calcium and a less fatty diet I would say have it checked out.
Mine is with both arms (does that make me special?), feels like a pocket of air.Sorry about the double post , but I wanted to add . Most of the time it is only one arm. At least in my experience.
I feed mealworms and give her a treat of waxworms less than once a month. She has food in her dish all day everyday. as well as a capfull of calcium and water of course
. Occasionally check to see if your Leo is obese. If the tail is very fat you should look at the "armpits" of each leg. Look to see if there is a ball or bubble of fat there. If there is, cut back slightly on the feedings, you have a fat Leo.