Skin Biopsy

What Is a Skin Biopsy?

A skin biopsy is a minor in-office procedure where a small portion of skin is removed and sent to a lab for analysis. This sample is then evaluated under a microscope to detect abnormalities, determine if a condition is benign or serious, and guide your care plan. At our Pasadena location, we primarily perform two types of biopsies:

Shave Biopsy
This technique removes the top layers of the skin and is typically used for superficial lesions or raised growths.

Punch Biopsy
Using a small, round blade, this method extracts a deeper cylindrical sample that includes all layers of the skin. It’s ideal for evaluating conditions that affect the deeper skin layers.

Each type of biopsy serves a specific purpose, and your provider will determine which method is best for your concern.

What to Expect During the Procedure

The biopsy process is quick and performed right in our office. Here’s how it works:

Step 1: Cleansing & Numbing
The area is thoroughly cleaned, and a local anesthetic is applied to keep you comfortable throughout the procedure.

Step 2: Sample Collection
Your dermatologist will carefully remove a small sample of skin using either the shave or punch method.

Step 3: Laboratory Testing
The sample is sent to a dermatopathology lab for microscopic evaluation to check for abnormal or cancerous cells.

Step 4: Results & Next Steps
Once your results are back, we’ll walk you through the findings and explain whether further treatment, monitoring, or follow-up is needed.

The procedure typically takes just 15 to 30 minutes, and most people find it to be low-stress and minimally invasive.

Why Are Skin Biopsies Important?

Skin biopsies play a critical role in modern dermatologic care. Here are a few key reasons why we recommend them:

Early Cancer Detection
Biopsies can identify basal cell carcinoma, squamous cell carcinoma, and melanoma before they progress, improving treatment outcomes.

Clarifying a Diagnosis
When visual inspection isn’t enough, a biopsy provides the microscopic detail needed to differentiate between similar-looking skin conditions.

Guiding the Right Treatment
Knowing exactly what you’re dealing with allows us to personalize your treatment plan for the most effective results.

Monitoring Chronic Conditions
For ongoing conditions like eczema or psoriasis, periodic biopsies can help us assess disease activity and response to treatment.

Evaluating Changing Moles or Lesions
If a mole has started to change color, grow, itch, or bleed, a biopsy is the gold standard for determining whether it poses a health risk.

FAQs

Is the procedure painful?
Most people experience only minimal discomfort. We use a local anesthetic to numb the area, so you’ll feel little to no pain during the biopsy.

How long does it take to receive results?
You can typically expect your results within 5 to 10 business days, depending on the complexity of the lab analysis.

Will it leave a scar?
Some scarring is possible, especially with punch biopsies. However, our providers use advanced techniques to minimize scarring and optimize healing.

Can I go back to work the same day?
Yes! Most patients resume regular activities right away. You may be advised to avoid vigorous exercise or water exposure for a few days.

What kinds of skin conditions require a biopsy?
Skin biopsies are commonly used to evaluate moles, skin tags, rashes, chronic inflammation, unusual pigmentation, and unexplained skin lesions.

What Happens After the Biopsy?

You’ll receive detailed aftercare instructions based on the type of biopsy you had. In general, aftercare may include:

• Keeping the site clean and dry for a day or two
• Using antibiotic ointment and a small bandage
• Avoiding sun exposure to the biopsy site
• Watching for signs of infection (redness, swelling, discharge)

Healing time varies depending on the biopsy location and your skin’s natural healing process. Most sites heal within 1–2 weeks with minimal discomfort.