Had hand surgery on palmer crease, cut reopened after stitches removed, how to care for and exercise hand now, also how long before fully functional?

Hand wound: It is not unusual for palm incisions to "gap". Typically i would soak the wound with soapy water for 10-15 minutes 2-3 times per day and keep it covered with a band aide or dry gauze depending in the size of the wound. I typically do not recommend ointment i would let your treating surgeon know to make sure they agree. This can delay healing for 1-2 weeks.

The palm skin often: Heals well with dressing changes. And uncomlicated healing times differ but a good average time ( known because there are certain surgical procedures where the pal is left intentionally open and unsutured) is about 3 weeks still as u had surgery call your surgeon! sometimes it is just the superficial dry or macerated skin and it is not open. Other times there could be infection or sinus tract.