In this guide7 sections
If you have had a skin lesion removed and you are waiting on histology results, this page explains what is happening to your sample, how long it takes, and what each possible result means.
Histology — sometimes called histopathology — is the microscopic examination of removed tissue by a consultant pathologist. It is the only way to know with certainty what a lesion actually was. Clinical examination and dermoscopy are very good, but they are an informed opinion. Histology is a diagnosis.
That distinction matters most where a benign lesion and a serious one can look alike. A pigmented seborrhoeic keratosis can closely resemble a melanoma, and the reverse is also true — which is why the report, not the clinical impression, is the answer.
At Centre for Surgery, every skin lesion we cut or shave off goes for histology. Not the suspicious ones. All of them — whether it is a mole, a cyst, a seborrhoeic keratosis or a xanthelasma. Typical skin tags are the exception and do not need to be sent. Laser leaves nothing to examine, so a lesion treated by laser is not sent.
How long do histology results take?
Your surgeon or a member of the clinical team will contact you directly with the result — you will not be left to chase it. Your expected timescale is confirmed at the time of your procedure, so you have a date to work towards rather than an open-ended wait.
How that compares with the NHS
The comparison is often misunderstood, so it is worth setting out properly, because the laboratory turnaround and the patient’s actual wait are two different things.
The Royal College of Pathologists sets the standard NHS laboratories work to. The target is to report 80% of diagnostic biopsy cases within 7 days, and 80% of all specimens within 10 days. Individual trusts publish their own versions of this — one sets a target of reporting 80% of urgent biopsies, urgent suspected cancer pathway cases and needle core biopsies within 7 to 10 days of receiving the specimen, and 80% of routine cases within 14 days.
But that clock starts when the laboratory receives the sample. The wait a patient actually experiences is longer, because it also includes the GP appointment, the referral, the clinic appointment where the lesion is removed, transport to the laboratory, and the result being communicated back. The British Association of Dermatologists describes a 3 to 4 week period between a biopsy and results as the current typical picture.
So the meaningful difference in a private pathway is not usually the laboratory work itself — it is that several of the queueing steps around it are removed.
Why histology cannot be instant
Some of the time is unavoidable chemistry rather than administration. Tissue must be fixed in formalin immediately, and adequate fixation typically takes 24 to 48 hours for small-to-medium specimens. Rushing that step degrades the cellular architecture the pathologist needs to read.
If your result takes longer than expected, that is usually a good sign of thoroughness rather than a bad sign about the result — see below.
What happens to your sample
- Removal and labelling. The lesion is placed straight into a pot of formalin and labelled with your details and a unique laboratory number, which is checked and re-checked at every subsequent stage.
- Fixation. Formalin preserves the tissue and stops it degrading. This takes 24 to 48 hours for a small specimen and cannot be shortened without compromising the result.
- Processing and embedding. Water is drawn out of the tissue and replaced with paraffin wax, creating a firm block that can be sliced very thinly. This usually runs overnight.
- Sectioning and staining. Slices a few thousandths of a millimetre thick are mounted on glass slides and stained — most commonly with haematoxylin and eosin, which is what produces the characteristic pink and purple appearance.
- Reporting. A consultant histopathologist examines the slides and issues a written report. Where the appearance is unusual, they may order additional stains or seek a second opinion, which adds time.
What your histology result can say
1. Benign, as expected
The report confirms the clinical diagnosis — a seborrhoeic keratosis, a benign mole, a cyst, a dermatofibroma. No further action is needed beyond routine wound care. This is what happens in the great majority of cases.
2. Benign, but not what we thought
Less commonly, the report confirms the lesion was harmless but identifies it as something different from the clinical impression. This changes nothing about your treatment, but it is useful to know — particularly if you develop similar lesions later.
3. Atypical or dysplastic
The cells show some irregular features but are not cancerous. The key question becomes whether the lesion was completely removed, which the report addresses by describing the margins. Depending on the degree of atypia and the margins, your surgeon may recommend a further small excision or simply monitoring.
4. Malignant
Occasionally a lesion that looked entirely benign turns out not to be. This is uncommon, but it is precisely why histology exists — and it is covered in full in the next section.
What happens if histology comes back as melanoma
We will tell you directly, promptly, and by phone rather than by letter or email.
What happens next is an NHS pathway, and we will say so plainly. Centre for Surgery is a private surgical clinic that removes skin lesions and sends every one it cuts or shaves off, apart from typical skin tags, for histology. We are not a skin cancer service. Melanoma care in the UK is delivered by a specialist skin cancer multidisciplinary team — dermatologists, plastic surgeons, oncologists, specialist nurses and pathologists working together — and that is where you need to be.
What we do:
- Contact you personally with the result and explain what the report says
- Provide the full histopathology report, including Breslow thickness, margins and any other features the team will need
- Arrange onward referral through your GP into an NHS skin cancer multidisciplinary team so you are assessed on the appropriate urgent pathway
- Send documentation to your GP so your records are complete
What we do not do: sentinel lymph node biopsy, wide local excision for melanoma, staging investigations or oncological treatment. Any clinic that offers to manage a melanoma diagnosis entirely in-house should prompt a question about how it is doing that.
An important point of reassurance. If a melanoma is found this way, it has been found — often earlier than it otherwise would have been, and often at a stage where outcomes are considerably better. The lesion is already out. That is a materially different position from one that was never sent for analysis.
Why every lesion should be sent for histology
This is the part of the conversation that rarely happens before treatment, and it matters more than almost anything else on this page. Our separate guide on whether every removed mole should be sent for biopsy makes the full case; the short version follows.
A lesion destroyed by cryotherapy, electrocautery or laser without histology is a diagnosis nobody made. Freezing or burning a lesion leaves nothing to examine. If it was benign, no harm done. If it was not, the evidence has been destroyed and the diagnosis delayed — often by months, because the treated area looks superficially better while the problem continues beneath.
This is a recognised route to late melanoma diagnosis, and it is a genuine risk of having lesions treated in settings where histology is not routine.
At Centre for Surgery, every lesion we cut or shave off, apart from typical skin tags, is sent for histology as standard, and the laboratory invoices you for it directly. See our skin lesion removal service for what that involves.
Frequently asked questions
How long do histology results take?
NHS laboratories work to a Royal College of Pathologists standard of reporting 80% of diagnostic biopsies within 7 days and 80% of all specimens within 10 days, though the wait patients actually experience is longer once appointments and referrals are included — the British Association of Dermatologists describes a typical 3 to 4 week period between biopsy and results. At Centre for Surgery your expected timescale is confirmed at the time of your procedure, and we contact you with the result rather than leaving you to chase it.
Does a longer wait mean bad news?
Usually not. Delays most often reflect additional stains, a technically difficult specimen, or a pathologist seeking a second opinion for accuracy. It is thoroughness rather than a signal about the diagnosis.
Will I be told the result even if it is normal?
Yes. Every patient is contacted with their result regardless of what it shows.
What does “margins” mean on a histology report?
The pathologist examines the edges of the removed tissue to check whether the lesion was completely excised. Clear margins mean normal tissue surrounded the lesion on all sides. Involved margins mean lesion cells reached the edge, which may prompt a further small excision.
What is Breslow thickness?
A measurement, in millimetres, of how deeply a melanoma has grown into the skin. It is the single most important factor in staging and prognosis, which is why it appears prominently on any report where melanoma is diagnosed.
Is histology included in the cost?
No. Histology is charged separately from the skin lesion removal fee at Centre for Surgery, and the laboratory invoices you for it directly.
Can I get a copy of my histology report?
Yes. You are entitled to a copy, and we will provide it on request.
What if I had a lesion frozen or burnt off elsewhere and I am now worried?
If a treated area has not healed, has recurred, or is changing, have it assessed. Bring any documentation you have about what was treated and how. Where there is genuine concern about melanoma, the correct route is an urgent GP appointment and referral onto the urgent suspected cancer pathway — not a private cosmetic consultation.
Book an assessment
- 📞 Phone: 020 7993 4849
- 📧 Email: contact@centreforsurgery.com
- 📍 95-97 Baker Street, Marylebone, London W1U 6RN
- Contact us to schedule your consultation
If you are worried that a mole or skin lesion may be cancerous, see your GP. The NHS urgent suspected cancer pathway exists precisely for this, it is free, and it is the fastest route to a specialist skin cancer team. A cosmetic consultation is not a substitute for it.
