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Salicylic Acid

Salicylic Acid

The treatment with the best evidence for warts and verrucas — and the one people abandon three weeks too early.

Skin

Bazuka, Salatac, Occlusal, Verrugon

Explained by a GMC-registered GP, not a leaflet

Honest about what we can and cannot prescribe remotely

Side effects given the same weight as benefits

Your NHS records in the room, with your consent

Clinically reviewed by Dr Mohammad Khan · Last reviewed

September 8, 2026

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Sick Notes
Private Prescriptions
Blood Tests
Menopause & HRT
Weight Management
Mental Health
Specialist Referrals

What it is

Salicylic acid is a keratolytic — it dissolves keratin, the tough protein that makes up the bulk of a wart. Applied daily, it gradually breaks the wart down layer by layer.

It also provokes a mild local immune response, and since warts are ultimately cleared by your own immune system recognising the virus, that probably contributes as much as the dissolving does.

It has the best evidence of any wart treatment, including cryotherapy — which surprises people, given how much more dramatic freezing looks.

What it is used for

  • Warts and verrucas — the main use
  • Corns and calluses, at similar strengths
  • Acne and scalp scale, in different formulations and much lower strengths

It is not for molluscum contagiosum, which looks similar to some people but is a different virus and usually needs no treatment at all.

How to take it

The routine matters more than the product, and it takes about ten minutes a day.

  1. Soak the area in warm water for 5 minutes
  2. File the surface down with an emery board or pumice stone — use one kept only for this, and never on other skin
  3. Dry thoroughly
  4. Protect the surrounding skin with petroleum jelly or a plaster with a hole cut in it — salicylic acid does not distinguish between wart and normal skin
  5. Apply the paint or gel to the wart only, and let it dry
  6. Cover with a plaster if using a paint

How long

Daily, for up to 12 weeks. Most treatment failures are people stopping at three or four weeks because nothing seems to be happening.

Expect it to look worse before it looks better — white, soft and macerated skin is the treatment working, not a reaction.

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Side effects

  • Redness, soreness and stinging around the wart
  • Skin peeling and whitening — expected
  • Burns to surrounding skin if it is not protected
  • Rarely, allergic contact dermatitis

Stop and take advice if the surrounding skin becomes very sore, blistered or infected, or if pain stops you walking on a treated verruca.

Salicylate toxicity is a theoretical risk only with very extensive use over large areas, and is not a practical concern for one or two warts.

Not suitable if

  • You have diabetes — particularly for verrucas on the feet. Reduced sensation and poor healing mean a chemical burn can become a serious foot ulcer. Take advice rather than self-treating
  • You have peripheral arterial disease or peripheral neuropathy, for the same reason
  • The wart is on the face or genitals — never use these products there
  • The skin is broken, infected or inflamed
  • You are allergic to aspirin or salicylates
  • The child is under 2

Anything changing in size, shape or colour, bleeding, or growing quickly is not a wart until someone has looked at it.

Interactions and monitoring

No meaningful systemic interactions at the doses used topically for warts.

No monitoring required.

What needs review is the diagnosis if it has not responded after 12 weeks of genuinely consistent treatment — a persistent lesion that is not clearing may not be a wart.

Can we prescribe this?

Warts rarely need a doctor, and salicylic acid is available in every pharmacy for a few pounds. We would rather tell you that.

Most warts clear on their own within two years without any treatment at all — faster in children. Treating is a choice about speed, discomfort and spread rather than a necessity.

Where a consultation is genuinely worth it:

  • You have diabetes or poor circulation and a verruca — do not self-treat this
  • It has not cleared after 12 weeks of proper treatment
  • You are immunosuppressed, where warts are more stubborn and more numerous
  • You are not sure it is a wart — and skin lesions assess well from good photographs
  • Facial or genital lesions, which need a different approach entirely

A prescription is never guaranteed. This page is information, not an offer to supply.

Cost and supply

Salicylic acid wart paints and gels cost a few pounds over the counter, and own-brand versions are equivalent to Bazuka and Salatac at a lower price. One bottle lasts a full course.

Buy an emery board at the same time — the filing is genuinely part of the treatment, not an optional extra.

NHS prescriptions are free in Wales, and free for children in England.

Where not to spend

  • Home freezing kits. They cost several times as much as a bottle of salicylic acid, are harder to use correctly, and the evidence does not show them working better
  • Duct tape. Trials have been mixed at best, and it is not a substitute
  • Private wart removal packages. For ordinary hand and foot warts this is money spent on something that would clear anyway

Stopping or switching

Stop when the wart has gone — when normal skin lines run across where it was. That is the reliable sign. A verruca with black dots still visible is still there.

Stop earlier if the surrounding skin becomes very sore, and restart once it settles with better protection.

Give it a fair trial

Twelve weeks of daily treatment with filing. Anything less is not a failed treatment, it is an incomplete one — and this is by far the commonest reason people conclude it does not work.

Alternatives

  • Cryotherapy — freezing, usually several sessions two to three weeks apart. The evidence is no better than salicylic acid, and it is more painful and more expensive. Combining the two may work better than either
  • Doing nothing — an entirely legitimate choice. Most warts clear within two years, and treatment mainly shortens that
  • Silver nitrate, or specialist options such as topical immunotherapy for resistant cases

Common questions

How long does it take?

Up to 12 weeks of daily treatment. Most people stop at three or four weeks and conclude it failed. It did not — it was not finished.

Do I really have to file it?

Yes. Filing removes the dead layer so the acid reaches living wart tissue. Skipping it is why treatment stalls.

Will it come back?

Sometimes. Warts are cleared by your immune system recognising the virus, and that can take time. Recurrence is not treatment failure.

Can I use it on a verruca if I am diabetic?

Not without advice. Reduced sensation and slower healing mean a chemical burn on the foot can turn into a serious ulcer. This is the one situation where self-treating is genuinely unwise.

Is freezing better?

No — the evidence does not favour it. Cryotherapy is more painful and more expensive, with comparable results. Using both together may do slightly better than either alone.

Do I need to treat it at all?

Not necessarily. Most warts clear on their own within two years. Treat if it hurts, is spreading, or bothers you — not because it must be removed.

Can I use it on my face?

No. Never on the face or genitals. Those need assessing and treating differently.

Dr Mohammad Zubair Khan, GMC-registered private GP and founder of Cheshire Clinics

Clinically reviewed by Dr Mohammad Zubair Khan, GMC 7563469

Last reviewed

September 8, 2026

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Questions about our service

How quickly can I be seen?

Same-day access is usually available, from 6am to 10pm, seven days a week. You choose a time that suits you rather than waiting on hold at 8am.

Will I see the same doctor each time?

Yes. Care is led personally by Dr Mohammad Khan, so you are not passed between clinicians. Continuity is the point of a small practice: someone who knows your history and is listening attentively rather than working through a checklist.

Can you see my NHS records?

Yes, with your consent. We can access your Summary Care Record during the consultation, so your current medications, allergies and significant history are in the room. That means fewer questions you have already answered elsewhere, and safer prescribing.

Are you trying to replace my NHS GP?

No. We are not here to replace GPs, only to support them. Your NHS practice remains responsible for your ongoing care, and with your consent we write to them after the consultation. We are useful when you need to be seen sooner, or want more time than a standard appointment allows.

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How much does it cost?

£40 for 20 minutes, self-pay. Membership is optional and never required. Priced for fairness, because we are not here to charge extortionate amounts for access to a doctor.

What does “treatable online” actually mean?

It means the diagnosis can usually be made from your history and photographs, and that treatment can be arranged safely without examining you. Where a condition is not marked treatable online, it is because examination is the diagnosis — listening to a chest, feeling an abdomen, examining an ear or a joint — or because a procedure or device is needed.

Can you prescribe antibiotics?

Yes, where there is a genuine bacterial infection — cellulitis, impetigo, bacterial urine infections, confirmed strep throat. We will also frequently tell you that you do not need one. Most sore throats, coughs, colds and earaches are viral, and an antibiotic gives you the side effects with none of the benefit.

What if the GP cannot help with what I need?

If your problem turns out to be genuinely outside what we can do remotely, the doctor will tell you straight away, point you to the right service, and refund your fee in full. We would rather do that than fill twenty minutes to justify the charge.

What should I do in an emergency?

Call 999 or go to A&E — do not book an online appointment and do not wait for a reply to an email. For urgent problems that are not emergencies, NHS 111 is available 24 hours a day, online or by phone, and can direct you to the right service.

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