Welcome!

I live in a dry, dry place and sometimes my lather dries too. You can just rinse off the old lather and re-do that spot. Some people rinse off their whole first lather before any shaving.

For me, lather off a puck of soap dries faster than shaving cream lather. I think the difference is I don't add as much water when I make the lather on my face. I've started making soap lather in a mug, and that seems to last longer before drying out.

Good luck and have fun.