AbstractPurpose Management of malignant eyelid tumors needs to be individualized, taking into account patient factors, tumor characteristics, and histological subtype. Several treatment modalities have been proposed, but surgical excision with monitoring of excision margins has the highest cure rate. The basis of ideal resection margins is almost completely from retrospective data. Moreover, resection margins of basal cell carcinoma are less extensive than spindle cell carcinoma, Merkel carcinoma or others. In another hand, Mohs surgery or complete surgical excision with frozen‐section control of the margins offers the lowest tumor‐recurrence rate.Methods The course will discuss of margins, Mohs and Frozen‐section control in malignant eyelid tumors especially for basal cell carcinoma