Final answer:
The procedure for excision of basal cell carcinoma on the left upper eyelid involves surgically removing the tumor under local anesthesia and closing the incision with sutures.
Step-by-step explanation:
If a patient has basal cell carcinoma on the left upper eyelid, the procedure for excision would involve surgically removing the tumor. The surgery would be performed under local anesthesia and typically involves making an incision around the tumor to remove it along with a margin of healthy tissue. After the tumor is removed, the incision is closed with sutures. The excised tumor would then be sent to a pathology lab for analysis to ensure complete removal.