Surgical Dermatology

Skin Biopsy Singapore

Dr. Liew Hui Min

accredited consultant dermatologist

A skin biopsy is a procedure performed by a dermatologist that involves removing a small sample of skin tissue for laboratory examination. It helps diagnose various skin conditions, including infections, inflammatory skin disorders, and cancerous or precancerous lesions. During this procedure, a small section of skin is removed using specialised instruments, which is then sent to a pathology laboratory where it is examined under a microscope to determine the exact nature of the skin abnormality.

Indications Benefits Techniques Preparation Procedure Recovery Risks FAQ

Indications for Skin Biopsy

The following conditions may require a skin biopsy for accurate diagnosis and appropriate treatment planning.

Suspicious Lesions: Skin growths that show changes in size, shape, colour, or texture may indicate skin cancer. A biopsy provides definitive identification of cancerous cells.
Persistent Rashes: Rashes that do not respond to standard treatments may need tissue examination. Laboratory analysis can differentiate between various inflammatory conditions.
Skin Infections: Unusual or treatment-resistant infections require identification of specific pathogens. Microscopic examination can detect bacteria, fungi, or viral particles.
Blistering Disorders: Conditions causing blisters or skin separation need diagnosis. Biopsies help differentiate between autoimmune, genetic, or inflammatory blistering diseases.
Pigmentation Abnormalities: Unexplained changes in skin colouration may signal underlying disorders. Tissue examination reveals cellular changes causing hyperpigmentation or hypopigmentation.

Benefits of Skin Biopsy

Skin biopsies offer several advantages in the diagnosis and management of dermatological conditions.

Diagnostic Accuracy

Microscopic examination provides definitive identification of skin conditions. This reduces diagnostic uncertainty and prevents unnecessary treatments.
Treatment Guidance

Biopsy results help determine the most effective therapeutic approach. Treatment plans can be customised based on specific pathological findings.
Disease Monitoring

Sequential biopsies can track disease progression or treatment response. Changes in tissue samples provide objective markers of improvement or deterioration.
Early Detection

Biopsies can identify precancerous changes before they progress. This allows for intervention at stages when treatment is more likely to be successful.
Infection Characterisation

Laboratory analysis can identify specific pathogens causing skin infections. This enables targeted antimicrobial therapy rather than empirical treatment.

Skin Biopsy Techniques

Shave Biopsy

This technique removes the top layers of skin using a surgical blade. The blade is moved horizontally across the skin to shave off the visible portion of the lesion and a thin layer beneath it. Shave biopsies work well for raised lesions and superficial conditions but do not sample deeper skin layers.

Punch Biopsy

This method uses a circular tool to remove a cylindrical sample of skin. The punch tool is rotated into the skin to cut through all layers, including the epidermis, dermis, and sometimes superficial fat. Punch biopsies provide a complete sample that includes all skin layers, making them suitable for diagnosing conditions affecting deeper tissues.

Excisional Biopsy

This approach removes the entire lesion along with a margin of normal-appearing skin. An elliptical incision is made around the lesion, extending into the subcutaneous fat. Excisional biopsies are used when complete removal of the lesion is desired, either for comprehensive diagnosis or as definitive treatment.

Incisional Biopsy

This technique removes only a portion of a larger lesion. A wedge-shaped section is cut from the most representative part of the lesion, including normal skin at one edge. Incisional biopsies allow sampling of large lesions that would be impractical to remove completely.

Preparing for the Procedure

Medical Assessment: A thorough evaluation of the skin condition and medical history occurs before scheduling the biopsy. This includes examination of the area in question, review of medical background, and discussion of any current medications. This assessment helps determine the most appropriate biopsy method and location.

Medication Review: Some medications may increase bleeding risk and require temporary discontinuation. Blood thinners such as aspirin, warfarin, or clopidogrel may need adjustment.

Infection Prevention: Keep the biopsy site clean and free of makeup, lotions, or creams. Before the appointment, gently wash the area with mild soap and water without scrubbing harshly. This minimises surface bacteria and reduces the risk of infection after the procedure.

Step-by-Step Procedure

Anaesthesia Administration

Anaesthetic is injected into the skin to numb the area using a fine needle. The initial injection causes brief discomfort, but the area becomes numb within minutes, allowing the remainder of the procedure to be performed without pain.

Tissue Removal

The selected biopsy technique is used to remove the skin sample. With punch biopsies, the tool is rotated between the fingers to cut through skin layers. For shave biopsies, a blade moves horizontally across the skin surface. Excisional biopsies involve cutting an ellipse around the entire lesion. The technique used determines the size and depth of the sample obtained.

Haemostasis

Bleeding is controlled using pressure, chemical cautery, or electrocautery. Gentle pressure with gauze stops minor bleeding from small biopsies. For larger blood vessels, electrocautery applies heat to seal them and prevent further bleeding.

Wound Closure

Depending on the biopsy type, the wound may be stitched closed or left to heal naturally. Punch and excisional biopsies typically require sutures to bring the edges together. Shave biopsies usually form a shallow wound that heals without stitches.

Specimen Handling

The tissue sample is placed in a preservative solution and labelled for the laboratory. The container is marked with patient information and clinical details.

Post-Procedure Care and Recovery

Wound Protection & Cleansing

Keep the biopsy site clean and covered with the recommended dressing for 24-48 hours. After this period, gently clean the area during shower, avoiding scrubbing or harsh antiseptics. Pat dry before applying a fresh dressing.
Activity & Pain Management

Limit strenuous activities that may stretch or irritate the biopsy site for 24-48 hours, including swimming and vigorous exercise. Manage mild discomfort with paracetamol if needed.
Suture Care & Follow-up

If stitches were placed, keep them dry for the first 24 hours. Stitches are typically removed within 5-14 days at your follow-up appointment, which also monitors your healing progress.

Potential Risks and Complications

Skin biopsies generally have minimal risks, but potential complications include infection, bleeding, and wound healing problems. Infection indicators include increasing pain, redness, warmth, or discharge from the site. Bleeding is rare but more common in patients on blood thinners or with bleeding disorders. Delayed healing can occur with diabetes, vascular disease, or compromised immunity. Damage to nearby nerves or blood vessels is uncommon but possible with deeper biopsies in complex areas.

Frequently Asked Questions

How long does a skin biopsy take?

The procedure typically takes 15-30 minutes from start to finish. Most of this time involves preparation, anaesthesia, and wound care instructions. The actual tissue removal usually requires only a few minutes.

When will I receive my biopsy results?

Results are generally available within 7-14 working days. Complex cases requiring additional testing or specialist consultation may take longer. When the results are ready, you will be contacted or you can discuss them at your follow-up appointment.

Will the biopsy leave a scar?

Some degree of scarring occurs with all biopsies. The extent depends on the biopsy size, location, technique used, and your skin’s healing characteristics. Punch and excisional biopsies typically leave more noticeable marks than shave biopsies. Scars generally fade over time but remain visible.

Dr Liew Hui Min

Dually Accredited Dermatologist In Singapore and the UK

Dr. Liew Hui Min is an accredited consultant dermatologist from the Ministry of Health and the General Medical Council UK.

Her clinical interest includes:

Paediatric Dermatology,
Women’s Dermatology,
General Adult Dermatology.

Having trained in major London Hospitals, Dr Liew returned to Singapore in 2014 as a Consultant at KK Women’s and Children’s Hospital (KKH) where she specialised in paediatric, women, obstetric and vulva dermatology. Currently, Dr Liew practices at The Skin Drs. clinic located at Gleneagles Hospital.

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