Punch biopsy

A punch biopsy is a minor procedure used to remove a small cylindrical sample of skin for microscopic analysis. It is commonly used to investigate rashes, inflammatory conditions and some lesions when the diagnosis is uncertain.

When a punch biopsy is used

A punch biopsy may be recommended when:

• A lesion has atypical features but is not suitable for complete excision at first
• There is suspected Bowen’s disease or other superficial malignancy

How the procedure is performed

The skin is cleaned and local anaesthetic is injected to numb the area. A circular blade, similar in size to a small pencil eraser, is pressed and rotated through the skin to obtain a core sample. The wound is then closed with one or more small stitches or allowed to heal naturally if very small.

The sample is sent to a pathology laboratory where a specialist examines it under the microscope to provide a diagnosis.

Aftercare and risks

Mild tenderness or bruising is common for a few days. You will receive instructions on keeping the area clean and when to have stitches removed if used.

• Small scar at the biopsy site
• Low risk of infection or bleeding
• Occasional need for further biopsy or excision depending on the result

If you have been advised to have a punch biopsy and have questions about the procedure, please contact us through the contact page.