Commentary on Dermoscopy as a complementary tool for positive margin demarcation on the Mohs' map.

Mohs micrographic surgery (MMS) is a technique that allows removal of complex or ill-defined skin cancer, combining tissue preservation and complete microscopic margin control. One of the main challenges of Mohs surgery is to illustrate the exact location of the tumour detected by light microscope. Using a dermoscope allows a fast, easy, reproducible way to accurately illustrate the location of a positive tumour on the Mohs map and ultimately transpose it to the surgical defect of the patient in a more precise way.