Skin biopsy
skin biopsy · punch biopsy · mole biopsy
Using local numbing, the doctor takes a small piece of skin, or the whole growth, and sends it to be checked under a microscope.
When it is not clear from looking what a spot, mole, or rash is.
⏱ Duration: usually 15 to 30 minutes
Be sure to tell your doctor
How to prepare
- Preparation. No special preparation is needed. You can usually eat as normal.
- Skin. On the day of the procedure, do not put cream or makeup on that spot.
- Medicines. Do not stop blood thinners on your own. Tell your doctor and they will decide.
What to bring
- Your referral
- Past reports from your dermatologist
- A list of your medicines
How it goes
- The doctor looks at the spot and cleans the skin
- You get a numbing injection and the skin goes numb
- With a small tool, the doctor takes a piece of skin
- The wound is closed with a stitch or tape, or sealed with heat
- The piece goes into a small jar and is sent to the lab
What you'll feel
- The numbing shot stings for a few seconds
- After that, only pressure. It should not hurt
- When the numbing wears off, the wound may ache a little
Afterwards
- Usually keep the bandage dry for 1 to 2 days
- Care for the wound the way your doctor told you
- Stitches usually come out after 7 to 14 days, depending on the spot
- Results usually take 1 to 3 weeks
Contact a doctor straight away if
- Bleeding that does not stop after pressing the wound for 15 to 20 minutes
- Growing redness, swelling, and pain, pus, or a fever
Common questions
Is it dangerous to biopsy a mole?
No. A biopsy does not make a mole more dangerous. It is needed to find out exactly what it is.
Will there be a scar?
Usually a small one that fades over time. Ask your doctor ahead of time where it will be and what it will look like.