This is a specialized technique which removes layers of tissue in sequenced. Each layer is prepared as a frozen section and examined histologically until all margins are clear.

The advantages of Mohs' micrographic surgery are:

It offers the highest cure rates for basal cell carcinoma in the central face — including the eyelids and peri-ocular area. It is recommended as the best treatment for completely removing morphoiec tumours, and recurrent tumours.
There is maximal preservation of normal tissues, which is particularly important around the face and eyelids, keeping the defect created small and hence the reconstruction easier for the oculoplastic surgeon.