I'm a bit confused why your doctor did not take a biopsy immediately?
I've had more BCCs than almost anyone my age and have done more biopsies than I can count. I'm a bit confused why your doctor did not take a biopsy immediately? I don't take any precautions at all with healing after a punch biopsy, might go climbing in the evening after even, but ymmv. If you have to operate a tumour on the back, expect a month without exercise, if you want it to heal without too much scaring. Cream or phototherapy is obviously better than cutting it out, if it is possible.