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Biopsy procedures

Punch Biopsy: — Stitches, Scars and What Actually Happens

A punch biopsy uses a small circular blade to remove a core of skin for laboratory analysis. The procedure is brief, done under local anaesthetic, and the question most people want answered before anything else is: what will the scar look like?

Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026

  • Full-thickness skin sample — The blade goes through all layers of the skin, giving the pathologist the depth needed to make an accurate diagnosis.
  • Local anaesthetic only — The area is numbed before the blade is used. You will feel pressure but not the cut itself.
  • A stitch or two to close — Most sites need one or two stitches, which your doctor removes at a follow-up visit.
  • A small, round scar — The scar starts firm and pink, then softens and fades over several months.
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A punch biopsy uses a small circular blade to remove a cylinder of skin under local anaesthetic. The procedure is brief and done in a clinic or outpatient setting. Depending on the site, you may need a stitch or two to close the wound. It leaves a small, round scar.

How is a punch biopsy different from a shave biopsy?

Punch biopsyShave biopsy
How the sample is takenA circular blade is pressed into the skin and rotated to cut a cylinder of tissue through all layersA flat blade slices across the surface, removing a thin layer without going deep into the skin
Depth of sampleFull thickness — epidermis, dermis, and the upper fat layerSurface layers only — the upper skin without the deeper dermis
AnaestheticLocal injection at the biopsy siteLocal injection or numbing cream, depending on the site and the doctor's approach
Stitches neededUsually one or two stitches to close the woundUsually not needed — the wound heals naturally with a dressing
Typical scarA small, firm, round mark that softens and fades over monthsUsually a flat, lighter patch at skin level
Commonly chosen whenThe lesion goes deeper into the skin, or the full thickness is needed for diagnosisThe lesion is raised or protruding and a surface sample is sufficient for diagnosis

What actually happens during a punch biopsy?

Your doctor cleans the area and injects a small amount of local anaesthetic. Most people say the injection stings briefly — after that, the area is numb and you will not feel the blade.

A circular punch tool is placed on the skin and rotated firmly to cut through all layers. The resulting cylinder of tissue is lifted out with a fine instrument and placed into a specimen container to go to the pathology laboratory.

The small wound is closed with a stitch or two and covered with a dressing. The whole procedure is usually complete well within half an hour, including the wait for the anaesthetic to take effect.

What will this actually cost you?

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Will a punch biopsy leave a permanent scar?

Yes — a punch biopsy leaves a scar, and being direct about that is more useful than hedging. What changes over time is how noticeable the scar is.

In the first few weeks the site is pink and slightly raised. Over several months it typically flattens, softens, and fades to a small, pale mark. How much it fades depends on where it is on the body, your skin tone, and how your skin heals.

If the appearance after healing concerns you, raise it with the doctor who performed the biopsy. Options for scar management can be explored once your result is back and any treatment that follows has been decided.

Did you know?

A punch biopsy specimen contains every layer of the skin in a single sample — from the surface cells through the dermis and into the top of the fat layer beneath. This depth is what allows a pathologist to assess how far a lesion has extended into the skin, something a surface scraping cannot show.

NCCN guidelines on non-melanoma skin cancers describe punch biopsy as appropriate for lesions where assessing the full depth of involvement is needed before treatment is planned.

Source: NCCN Clinical Practice Guidelines in Oncology: Squamous Cell Skin Cancer; Basal Cell Skin Cancer

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Common questions

Frequently asked questions

How many stitches does a punch biopsy need?

Most punch biopsy sites are closed with one or two stitches. The number depends on the size of the sample taken and where on the body it is — areas under more tension, such as the scalp or over a joint, may need an extra stitch to hold the edges together. Your doctor will tell you how many were placed and when they need to come out, which is usually around one week after the procedure.

What will the scar look like after a punch biopsy?

Immediately after healing, the site is usually a small, round, pink or red mark that feels slightly firm. Over several months it typically flattens and fades to a pale, flat mark that is much smaller than the wound initially appeared. The final appearance varies depending on where on the body the biopsy was taken, your skin tone, and how your skin heals. If you are concerned about scarring in a visible area, mention it before the procedure so your doctor can discuss what to expect.

How long does a punch biopsy take?

The procedure itself is brief — once the anaesthetic has taken effect, the sampling and wound closure usually take only a few minutes. Most people are ready to leave well within half an hour, including preparation time. You do not need to fast beforehand, and you can usually go home immediately afterwards with a small dressing in place.

Is a punch biopsy painful?

The injection that delivers the local anaesthetic is the part most people find uncomfortable — a brief stinging or burning sensation as the numbing takes effect. After that, you should feel pressure and a small amount of pulling when the tissue is removed, but not pain. If you feel pain during the procedure, say so immediately. More anaesthetic can be added at any point and your doctor will expect you to speak up.

How long do punch biopsy results take?

Standard laboratory processing of a skin biopsy specimen typically takes between one and two weeks, though it can take longer if additional staining or specialist testing is needed on the sample. Your doctor will tell you when to expect the result and how it will be communicated. Do not read a delayed result as a sign that something is wrong — complex specimens often take more time to report accurately.

Can I ask for a different type of biopsy?

The type of biopsy is a clinical decision based on what needs to be diagnosed, where the lesion is, and how deep a sample is needed. Punch biopsy is selected when the full thickness of the skin is needed for an accurate result. If you want to understand why a particular technique was recommended for you, ask your doctor before the procedure — that is a reasonable question and deserves a clear answer. The final decision is a clinical one, but understanding the reason is your right.

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