Why is one hand extremely dry and cracked, but not the other?

I have read that low thyroid hormone can cause this. But if that were the cause, would you expect only one hand to have that problem and not the other?
Answers

Vortex

If you are a guy it is probably lube that you rub into one hand that keeps it very soft.

Emma

eczema, try taking a fish oil supplement and reducing sugar and carb intake