In short. Surgical excision of basal cell carcinoma, squamous cell carcinoma and melanoma, why complete clearance comes first, how margins and reconstruction are planned, and what follow-up involves.
Key points
- Small defects can be closed directly.
- Larger ones may need a skin graft or a local flap that brings nearby tissue into the area.
- Reconstruction may be delayed until the pathology is known, so that a margin which is not clear can be re-excised before the area is rebuilt.
Skin cancer is the most common cancer in many populations, and surgical excision is the main treatment for basal cell carcinoma, squamous cell carcinoma and melanoma. The principles are straightforward even when the surgery is not: remove the tumour completely, confirm that with a microscope, and then deal with the defect left behind.
Clearance comes before appearance
The first priority in cancer surgery is complete removal of the tumour, and that takes precedence over the look of the scar. A margin of normal-looking skin is taken around the cancer, because tumour cells can extend beyond what the eye can see. How wide that margin is depends on the diagnosis, the site, and how the tumour has behaved. An aggressive tumour, or one on a site where recurrence is hard to treat, generally needs a wider margin than a small, slow-growing lesion.
Site changes the plan
A lesion on the nose, eyelid, ear or lip is treated differently from one on the back or shoulder. These areas are visible, they have little spare skin, and removal can affect an eyelid or a lip, so the strategy is often more conservative. On the back or a limb, a wider margin is easier to close and easier to accept. The diagnosis matters too: melanoma is generally managed with a wider margin and closer follow-up than a small basal cell carcinoma.
Margin assessment and the pathology report
With conventional excision, the specimen is sent after the wound is closed and the report arrives days later. Margin-controlled techniques map and examine the tissue during the procedure, so any involved area can be taken before you leave the operating room. Both aim at the same thing. The report will describe margins as clear, involved or close. A clear margin means no tumour at the cut edge; an involved margin usually means further surgery; a close margin is a judgement call based on the site, the tumour type and the risk of recurrence.
Reconstruction after cancer removal
Small defects can be closed directly. Larger ones may need a skin graft or a local flap that brings nearby tissue into the area. Reconstruction may be delayed until the pathology is known, so that a margin which is not clear can be re-excised before the area is rebuilt. That delay is deliberate and protects the clearance that matters most.
Follow-up and sun protection
A scar will remain after skin cancer surgery, and it will be more visible on the face than on the back. Having one skin cancer raises the chance of developing another, so regular skin checks and daily sun protection are part of treatment, not optional extras. Report any new or changing lesion between visits rather than waiting for the next appointment.
Arrange review without delay if
- A new lump, sore or changing spot appears anywhere, especially on sun-exposed skin.
- A previously treated area develops a nodule, bleeding or crusting that does not settle.
- A graft or flap becomes dark, cold, or increasingly painful in the days after surgery.
Frequently asked questions
Why is a margin of normal skin taken around a skin cancer?
Because tumour cells can extend beyond what the eye can see. How wide that margin is depends on the diagnosis, the site, and how the tumour has behaved — an aggressive tumour, or one where recurrence is hard to treat, generally needs a wider margin than a small, slow-growing lesion.
What does it mean if the pathology report calls a margin involved?
A clear margin means no tumour at the cut edge. An involved margin usually means further surgery. A close margin is a judgement call based on the site, the tumour type and the risk of recurrence, and it is discussed rather than assumed.
Why might reconstruction be delayed until the pathology is known?
So that a margin which is not clear can be re-excised before the area is rebuilt. The delay is deliberate, and it protects the clearance that matters most. Small defects can be closed directly; larger ones may later need a graft or a local flap.
Risks & Limitations
- Reconstruction is usually staged — more than one operation is normal, and the plan may change as healing progresses.
- Donor-site scarring and discomfort, including after rib cartilage harvest.
- Partial or complete failure of a flap or graft, which may require further surgery.
- Scars are permanent. They mature and fade but never disappear.
- Asymmetry and the inherent limits of matching a normal side.
- Altered sensation, numbness or weakness in the operated area.
- Contracture, which may need release procedures later.
- Final assessment is made at 6–12 months, and longer in growing children.
When to Seek Care
- A flap or graft that turns dark, cold, black or stops bleeding when pricked.
- Fever above 38 °C, or spreading redness, warmth or discharge around a wound.
- New or worsening pain, swelling or fluid leakage from the operative site.
- Bleeding that does not stop with gentle pressure.
- Any change in a reconstructed area that concerns you, however minor.
References & Further Reading
- American Society of Plastic Surgeons (ASPS) — reconstructive surgery guidance
- World Health Organization (WHO) — burn and trauma care resources
- Chinese Medical Association, Plastic Surgery Branch — clinical guidance
- Cochrane Library — systematic reviews in wound and reconstructive care
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.