What is a Nail Biopsy?
A nail biopsy is a minor surgical procedure in which a small sample of nail tissue — from the nail plate, nail bed, or nail matrix — is taken for laboratory examination. It helps doctors diagnose a variety of nail disorders and rule out serious conditions such as infections, inflammatory diseases, or even cancers affecting the nail unit.
Why is it Done?
Your dermatologist may recommend a nail bed or matrix biopsy if you have:
Persistent nail discoloration (brown/black streaks, white spots)
Unexplained nail deformities
Pain, swelling, or thickening under the nail
Suspected fungal, bacterial, or viral infection not confirmed by other tests
Suspicion of conditions like psoriasis, lichen planus, or melanoma of the nail
Types of Nail Biopsy
Nail Plate Biopsy – Sampling only the nail plate (the hard part of the nail)
Nail Bed Biopsy – Tissue taken from the skin under the nail plate
Nail Matrix Biopsy – Tissue taken from the nail growth area (base of the nail)
Punch Biopsy – A circular blade used to remove a small section
Longitudinal Biopsy – A slice of nail unit taken lengthwise for detailed analysis
Procedure Overview
Preparation & Numbing – Local anesthesia is given to make the procedure painless.
Nail Plate Removal (if needed) – The nail plate may be partially or fully removed for access.
Tissue Sampling – A small section of the nail bed or matrix is carefully removed.
Closure – The site may be closed with fine sutures or left to heal naturally.
Dressing – A protective dressing is applied to keep the area clean.
The whole procedure usually takes 15–30 minutes.
Recovery & Aftercare
Keep the dressing dry for 24–48 hours.
Avoid heavy use of the finger/toe for a few days.
Mild pain or swelling can be managed with prescribed medication.
Stitches, if present, are removed in 7–14 days.
Temporary nail deformity or slower nail growth may occur.
Risks & Considerations
Nail biopsies are generally safe but may rarely cause:
Temporary discomfort or swelling
Minor bleeding or infection
Permanent nail shape changes (especially with large matrix biopsies)