Mole freezed by my local GP and it’s gone black and scabby: I’m a bit worried. (Photo)

It is not unusual for a lesion treated with liquid nitrogen to develop a crust or scab several days later.  For the best cosmetic outcome be sure to protect this area from the sun.  It may take a few more weeks for things to look normal.  If the scab is still there weeks after the treatment see your physician.