Eucerin is good. It's got 5% urea in it which helps fight the build up of hard skin. I use the foot cream it's amazing.
Hi @Lynmi. A few tips which might help.
As said rotate you fingers.
Ensure your finger pricker is set correctly ( no use drilling for oil when all you need is to plant some seedlings)
Warm/ wash your hands prior to testing.
Moisturise with cream ( cocoa butter I find good ).
Purchase a pumice stone to remove hard skin on a regular basis.
Change your lancet on a regular basis.
Fingers crossed ( bit of a pun ) things may improve.