From what I see it and from my experience,
if the lump isn't hard, then its nothing to worry about at all.
Those are just fat deposits. A lot of males and especially females have these 'lumps' at the end of it's tails. I have heard that these lumps are caused by too much breeding for the females. It doesn't effect it's health or anything.
Remember as long as it's eating, drinking, poping, and shedding alright then it's nothing much to worry about. Don't worry too much.
Good Luck and Happy Herping!
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