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Skin Biopsy
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Lab Tests

Skin Biopsy

A skin biopsy is a procedure that removes a small sample of skin for microscopic examination to diagnose skin disorders, infections, or skin cancer.

Overview

A skin biopsy is a procedure that removes a small sample of skin to check for various conditions. There are three main types of biopsies, determined by the size and location of the abnormal area (lesion):

  • Punch biopsy: Uses a tool with a round blade to remove a small, deep piece of skin.
  • Shave biopsy: Uses a razor blade to remove a sample from the topmost layers of the skin.
  • Excisional biopsy: Uses a scalpel to remove the entire skin lesion.

What is it used for?

Biopsies help diagnose skin disorders like psoriasis and eczema, as well as bacterial or fungal infections. They are also critical for identifying skin cancer, the most common type of cancer in the United States. The three most common types of skin cancer are:

  • Squamous cell carcinoma: Forms in the upper epidermis; rarely spreads.
  • Basal cell carcinoma: Forms in the lower epidermis; the most common type and rarely spreads.
  • Melanoma: Forms in pigment-producing cells; less common but more dangerous because it is more likely to spread.

Why do I need a skin biopsy?

You may need a biopsy if you have persistent rashes, scaly skin, open sores, or a mole that exhibits the "A-B-C-D-Es" of melanoma:

  • Asymmetrical: Irregular shape.
  • Border: Jagged edges.
  • Color: Uneven color.
  • Diameter: Larger than a pea.
  • Evolving: Changing in size, shape, or color over recent weeks or months.

What happens during the procedure?

After cleaning the site and injecting an anesthetic, the provider performs the biopsy based on the chosen method:

  • Punch: A circular tool is rotated to remove a piece of skin; stitches may be required.
  • Shave: A razor or scalpel removes the top layer; pressure or topical medicine is used to stop bleeding.
  • Excisional: A scalpel removes the entire lesion; the site is closed with stitches.

After the procedure, the site is covered with a bandage. If stitches were used, they are typically removed 3–14 days later.

Understanding Results

Normal results indicate no cancer or skin disease. If results are abnormal, you may be diagnosed with an infection, a skin disorder, or skin cancer. If diagnosed with basal or squamous cell carcinoma, the lesion may have been fully removed during the biopsy. If diagnosed with melanoma, further testing will be required to determine if the cancer has spread and to develop a treatment plan.

Frequently Asked Questions

Yes, the type of biopsy can impact diagnostic accuracy. A shave biopsy only samples the top layers of skin, which is sufficient for many superficial lesions but may miss deeper structures needed to determine the depth of invasion in melanoma. A punch biopsy provides a full-thickness sample, offering better detail for deeper tissues. An excisional biopsy removes the entire lesion, providing the most comprehensive sample for staging and margin assessment. Your dermatologist selects the method based on the suspected condition to ensure the most accurate diagnosis.
Keep the area clean and dry. Your provider will give specific instructions, but generally, you should apply a thin layer of antibiotic ointment and cover the site with a bandage for the first few days. Change the dressing daily or whenever it becomes wet or dirty. Avoid picking at the scab, as this can lead to scarring or infection. For shave biopsies, the site may heal faster, but it is still important to protect it from sun exposure once healed to prevent hyperpigmentation.
Most skin biopsy results are available within one to two weeks, though complex cases involving special stains or molecular testing may take longer. If the initial biopsy is inconclusive or does not match the clinical appearance, your dermatologist may recommend a repeat biopsy. This second sample might be taken from a different area of the lesion or using a different technique, such as a deeper excisional biopsy, to obtain more tissue for a definitive diagnosis.
Mild redness, swelling, and tenderness at the site are normal for a few days. However, you should contact your provider if you notice increasing redness, warmth, pus or yellow discharge, fever, or severe pain that is not relieved by over-the-counter pain medication. These symptoms may indicate an infection that requires antibiotic treatment. Additionally, if the wound does not close properly or bleeds excessively after the initial scab forms, seek medical attention.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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