What should you know about Mohs surgery for skin cancer?

The surgeon numbs the area, removes the visible tumour with a thin margin and creates a map of the specimen. The tissue is examined, and another layer is removed only where cancer cells remain. This cycle continues until the examined edges are clear. The resulting wound may be closed directly or repaired with a flap, graft or another method, depending on its size and position.

Mohs is frequently used for [Basal Cell Carcinoma](/conditions/basal-cell-carcinoma/) and [Squamous Cell Carcinoma](/conditions/squamous-cell-carcinoma/). [Surgical Excision](/treatments/surgical-dermatology/excisional-surgery/) is another approach, and the choice depends on the cancer and its setting.

Give the clinic a complete list of medicines and supplements, including anything that affects bleeding. Keep the appointment schedule flexible because the tissue checks can require more than one removal stage. Afterward, follow dressing and activity instructions, keep the wound clean as directed, and attend the planned review so healing and reconstruction can be checked.

Ask for assessment of a sore, crusted, bleeding or growing skin lesion. After Mohs, contact the surgical team for bleeding that persists despite pressure, worsening rather than settling pain, increasing redness or warmth, pus, fever, marked swelling, or a wound that opens. Sudden facial weakness or breathing difficulty needs emergency care.

Why is Mohs recommended for this cancer? How many stages might be needed? How will the wound be repaired? Which medicines should I take or pause? When can I wash the area, work, exercise and return for review?