Field Notes · October 8, 2025 · 6 min · By Kira Vandenberg
What is Mohs surgery, and why does it have the highest cure rate?
The technique that checks the margins under the microscope while you wait.
Mohs micrographic surgery is the gold standard for removing many skin cancers, and its advantage comes down to one thing: it checks the edges of the tumor under the microscope before you leave.
In a standard excision, the surgeon removes the visible cancer plus a margin and sends it to a lab; results come days later, and if the margins are not clear, you return for more surgery. In Mohs, the surgeon removes a thin layer, maps it precisely, and examines essentially the entire margin under a microscope on-site. If cancer remains at an edge, the surgeon removes only more tissue from that exact spot and rechecks, repeating until the margins are clear, all in one visit. For an independent overview, see Mohs micrographic surgery: how margin checking works.
Two benefits follow. The cure rate is the highest of any treatment for common skin cancers, often around 99 percent for primary basal and squamous cell carcinomas, because no tumor is left behind unseen. And because tissue is removed only where cancer actually is, Mohs spares the most healthy skin, which matters enormously on the face. That combination of precision and tissue conservation is why Mohs is the standard for skin cancer in cosmetically and functionally sensitive areas.
Related reading: What to expect on the day of Mohs surgery.
A few principles hold across skin cancer care. The right plan is the one matched to the tumor type, its location, and your individual risk, not a one-size-fits-all rule. For cancers on the face and other sensitive areas, margin checking and tissue conservation matter most, which is where Mohs surgery earns its reputation. Ask why a given approach fits your specific lesion before any treatment begins.
Outcomes also depend on realistic staging and good aftercare. A careful consultation should set out the expected timeline in plain terms, name the recovery, explain how the wound will be repaired, and describe the plan if a side effect appears. Final cosmetic results are best judged over months as the skin remodels, and steady, sun-protected scar care helps the repair settle.
For independent background on this topic, see Mohs micrographic surgery: how margin checking works, and review the full source list below. This article is editorial reporting and is not a substitute for a consultation with a board-certified dermatologist.