Nail Unit Lesion Removal: Warts & Growths Under Fingernails

Lesions of the Nail Unit

The “nail unit” is the whole apparatus that makes and holds the nail — the matrix (growth plate), the nail bed beneath the plate, and the surrounding folds of skin. Warts are the most common growth here: periungual warts sit at the nail edge, while subungual warts grow under the plate. Both are more stubborn and more likely to recur than warts elsewhere, because the nail physically shields the virus from treatment and from your immune system. They can lift or distort the nail, catch painfully, and are easily spread by nail-biting — which also makes them worse.

Not Every Nail Growth Is a Wart

This is the single most important point on the page. Several other things arise in the nail unit — some harmless (like a myxoid cyst or a viral wart), some that need prompt attention. A new dark streak or pigmentation under the nail, a growth that bleeds, ulcerates, hardens or grows rapidly, or a lesion that simply doesn’t behave like a wart should be examined and, if needed, biopsied — precisely because a subungual melanoma or other skin cancer can, rarely, masquerade as a benign nail problem. In Mr Gilleard’s words, a wart that “bleeds without trauma, changes colour, grows rapidly, ulcerates, or has failed repeated standard treatment” is one he’d want examined and possibly biopsied rather than simply treated as a wart. Getting the diagnosis right comes before any removal.

Why the Nail Matrix Demands Care

Treatment around the nail is technically demanding for one reason: the nail matrix sits just millimetres from the lesion, and it is the matrix that produces a smooth, healthy nail. Damage it — with an aggressive freeze, an over-deep burn, or a home kit — and the nail can be permanently ridged, split or deformed. A wart genuinely under the nail plate sometimes needs a portion of the nail lifted or removed to reach it safely. This is exactly the kind of work that belongs with a consultant plastic surgeon who operates on the hand and nail routinely, rather than being frozen blindly or dug at.

CO₂ Laser vs Excision

Two precise methods do most of this work, chosen by lesion type and position:

• CO₂ laser — vaporises the lesion layer by layer with fine control, useful for periungual warts and where preserving surrounding tissue matters.
• Surgical excision — removes the lesion (sometimes with partial nail removal for access), and is preferred whenever tissue should be sent for analysis.

Both are performed under local anaesthetic, often a ring block to numb the finger completely. We rarely use cryotherapy at the nail because of the pigment and matrix risks. The general method comparison is in our wart & verruca removal guide, and finger warts more broadly in wart on a finger.

Recovery and Nail Regrowth

Aftercare follows the usual principles — keep the wound clean and lightly moist rather than dry-scabbing, don’t pick it, and protect it while it heals, usually over one to two weeks. If part of the nail was removed for access, the nail regrows slowly: a fingernail takes roughly four to six months to grow out fully, and it typically returns normally when the matrix has been protected. Expect the treated finger to be a little tender for a few days; keep it dry initially and avoid knocks. Report spreading redness, increasing pain or pus, which are uncommon signs of infection.

Cost and Consultation

Removal starts from £300 with a £100 consultation at which the diagnosis is confirmed and the safest approach agreed; the exact cost depends on the lesion and whether nail surgery or histology is needed, and is always confirmed beforehand. You don’t need a GP referral to book. View the wart removal procedure · book a consultation or call 0203 916 6200.

Your Questions, Answered

What specialist removes lesions of the nail unit?

A consultant plastic surgeon (or a dermatologist) with experience of the hand and nail. Because the nail matrix is millimetres away and careless treatment can permanently deform the nail, nail-unit lesions are best not treated at home or with pharmacy kits.

Can warts under the nail be removed?

Yes. Subungual warts are removed by CO2 laser or excision under local anaesthetic, sometimes lifting or removing part of the nail for access. They’re more stubborn than warts elsewhere because the nail shields the virus, so more than one session is occasionally needed.

Is removing a nail lesion painful?

The finger is numbed with local anaesthetic (often a ring block), so the procedure itself is essentially pain-free. There’s mild tenderness for a few days afterwards, settled with simple painkillers.

Will I lose my fingernail?

Usually not. If part of the nail is removed for access, it regrows over about four to six months and typically returns normally when the matrix is protected. Careful technique is aimed at preserving a smooth nail.

A dark streak has appeared under my nail — is that a wart?

Not necessarily, and it shouldn’t be assumed to be. A new dark streak or pigmentation under a nail needs prompt assessment, because rarely a subungual melanoma can look like a benign nail change. Have it examined rather than treated as a wart.