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Skin biopsy techniques

Punch, Shave or Excision — — Which Biopsy for Your Skin Lesion?

The technique your doctor uses to sample a skin lesion is not a minor detail. For suspected melanoma, choosing the wrong method can make the pathologist's most important measurement impossible to take.

Medically reviewed by Dr. Mohammed Imaduddin, Surgical Oncologist, MBBS · MS (General Surgery) · M.Ch (Surgical Oncology) · Last reviewed September 2026

  • Technique follows the suspected diagnosis — The right biopsy depends on what the doctor suspects, not just where the lesion is.
  • Shave has a specific limitation — Shave biopsy should not be used when melanoma is a possibility — it can prevent accurate depth measurement.
  • Depth decides melanoma staging — How deeply a melanoma has grown into the skin determines treatment. An incomplete sample can hide this.
  • Scars differ by method — Punch, shave and excision each leave a different kind of mark. The size and shape are predictable.
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The right technique depends on the lesion. Punch biopsy suits inflammatory conditions and most pigmented lesions. Shave biopsy works for raised, clearly benign lesions but should not be used when melanoma is suspected — it can cut across the tumour and make depth impossible to measure, which is critical for staging.

Which technique is used for which lesion?

Punch biopsy uses a small circular blade to remove a cylinder of skin and the tissue beneath it. It is the standard approach for rashes, inflammatory conditions, and most pigmented spots where melanoma is not the leading concern.

Shave biopsy slices the raised part of a lesion off at approximately skin level. It suits lesions that are clearly raised and clinically benign — a seborrheic keratosis, for example — but it is the wrong choice when melanoma cannot be ruled out.

Excision biopsy removes the lesion in full, with a clear rim of normal-looking skin around it. NCCN and ESMO guidelines specify excisional biopsy as the preferred method when melanoma is being considered, and it is also used for larger or deeper lesions where a small punch sample would be inadequate.

For suspected deep soft-tissue or bone tumours, biopsy planning should involve the surgeon who would perform any definitive operation. A poorly planned incision can compromise later surgery, which is why this decision is specialist-dependent.

Why does depth matter, and why does it change the technique?

For melanoma, the most important single piece of information is how deeply the tumour has grown into the skin. This measurement — called Breslow thickness — is the foundation of staging and drives decisions about further surgery and whether a sentinel lymph node biopsy is recommended.

A shave biopsy cuts horizontally. If the tumour extends deeper than the cut, the pathologist receives an incomplete sample and cannot measure the true depth. That missing measurement can result in a stage that is lower than the actual disease.

Even a correctly performed shave biopsy of a melanoma can produce a report that says the depth is at least a certain amount — not the true depth, just the amount that was captured. That is a different and much less useful piece of information.

What each biopsy technique actually means

Punch biopsy
A circular blade, usually a few millimetres across, removes a short cylinder of skin and underlying tissue. The small wound is usually closed with one or two stitches or left to heal on its own.
Shave biopsy
A flat cut removes the superficial part of a raised lesion at approximately skin level. No stitches are needed. The sample does not capture deep tissue.
Excision biopsy
The lesion is cut out in full with a margin of normal-looking skin on each side, and the wound is closed with stitches. Removing the lesion in one intact piece gives the pathologist the most complete sample.
Breslow thickness
The measurement of how deeply a melanoma has grown into the skin, taken from the biopsy specimen. It is the single most important factor in melanoma staging.
Sentinel lymph node biopsy
A separate procedure, usually done after diagnosis, that checks whether melanoma cells have reached the nearest lymph nodes. Whether it is recommended depends in part on the Breslow thickness.

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What happens during a skin biopsy

  1. Local anaesthetic

    The area around the lesion is numbed with a small injection. Most people feel a brief sting and then nothing during the procedure itself.

  2. The biopsy

    The lesion is removed using the agreed technique. A punch or shave biopsy takes one to two minutes. An excision takes longer and the wound is closed with stitches.

  3. The sample is sent to pathology

    The tissue is labelled with your clinical details and the suspected diagnosis, then sent to a pathology laboratory.

  4. Results

    Most biopsy results are ready within one to two weeks. Your doctor will contact you when the report arrives.

  5. Follow-up

    Depending on the result, you may need further surgery, monitoring, or no further treatment. Your doctor will explain what the report means and what comes next.

Before your biopsy: what to tell your doctor and what to ask

  • Tell your doctor if you take blood thinners, aspirin, or any anticoagulant — timing may matter
  • Mention any known allergy to local anaesthetic or antiseptic
  • Ask which technique will be used, and why that technique was chosen for your specific lesion
  • Ask whether the lesion will be removed completely or only sampled
  • Ask when and how you will receive the result, and who to contact if you have not heard within two weeks
  • If the lesion is deep, rapidly changing, or the diagnosis is uncertain, ask whether a specialist surgeon should be involved in planning the biopsy before it is done

Did you know?

The Breslow thickness — the depth of a melanoma measured from the biopsy specimen — is the single most important factor in melanoma staging.

A shave biopsy that cuts across the base of the tumour makes this measurement impossible. NCCN guidelines specify excisional biopsy for suspected melanoma precisely because of this.

Source: NCCN Guidelines for Cutaneous Melanoma

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Common questions

Frequently asked questions

Will the biopsy leave a scar?

Yes, every skin biopsy leaves some mark, but the size and appearance vary by technique. Punch biopsies leave a small circular mark, usually a few millimetres, that fades over months. Shave biopsies leave a flat, saucer-shaped area at skin level. Excisions leave a linear scar, typically longer than the original lesion because the wound is closed under some tension. All three become less noticeable over time, and your doctor will plan the incision to favour good healing where possible.

What if a shave biopsy was already done on my mole?

Tell your oncologist straight away. This is not uncommon. If the pathology report shows melanoma and the depth is recorded as extending to the base of the sample — meaning the true depth may be greater — your surgeon will likely recommend re-excision of the biopsy site. The treating team will explain exactly what the report says and what the next step is. Do not assume the worst before that conversation; what matters now is having it promptly.

Does it matter who does the biopsy for a suspicious lesion?

Yes, particularly when melanoma is a possibility or for deep soft-tissue lumps. For skin lesions, a dermatologist or surgical oncologist experienced in melanoma should plan the approach. For suspected soft-tissue sarcomas, NCCN and ESMO both specify that biopsy planning should involve the surgeon who would perform the definitive operation — a poorly placed incision can compromise curative surgery later. If there is any uncertainty about the diagnosis, ask for a specialist referral before the biopsy is done.

Can a doctor diagnose a skin lesion just by looking at it?

Sometimes a doctor can be highly confident from examination alone, and many lesions — skin tags, obvious cysts, clearly benign keratoses — do not need a biopsy at all. Dermoscopy, a magnified examination with a handheld instrument, significantly improves clinical accuracy for pigmented lesions. But neither clinical examination nor dermoscopy can provide the certainty that pathology does. When there is genuine doubt, biopsy is the only way to know, and a lesion that looks benign is sometimes not.

How long does a skin biopsy take?

A punch or shave biopsy is usually completed in ten to fifteen minutes, including preparation and time for the local anaesthetic to work. An excisional biopsy takes longer — typically twenty to forty-five minutes depending on size and location — because the wound requires stitching. Most people return to normal activity the same day, though your doctor may ask you to avoid heavy exercise or immersing the wound in water for a few days while it heals.

What does it mean if the biopsy result is non-diagnostic?

A non-diagnostic result means the pathologist could not draw a conclusion from the tissue received. This can happen if the sample was too small, too superficial, or not representative of the lesion. It is not a clean bill of health — it means the question has not yet been answered. Your doctor will discuss whether a repeat biopsy is needed and, if so, whether a different technique or a larger sample is required. Ask specifically what was inconclusive and what the plan is.

Full index

Browse all 701 biopsy topics

Every page in this section, grouped by the part of the journey it belongs to. Pick a group to see what is in it.

What Is a Biopsy?

What Is a Biopsy? Everything You Need to Know →

Types of Biopsy Compared

Which Biopsy Will You Have? Techniques Compared →

Preparing for a Biopsy

What to Expect on the Day of Your Biopsy →

Recovery and Aftercare

After a Biopsy: Recovery, Aftercare and Warning Signs →

Biopsy by Body Part

Biopsy by Body Part: What to Expect at Each Site →

Understanding Your Report

How to Read a Biopsy Report: Terms Explained →

IHC and Molecular Markers

IHC and Molecular Markers on a Biopsy: What They Mean →

Grading and Scoring Systems

Cytology & Prostate Scoring Systems Explained →

How Accurate Is a Biopsy?

How Accurate Is a Biopsy? Errors and Second Opinions →

If Your Result Is Benign

Your Biopsy Is Benign: What It Means and What Comes Next →

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