Melanoma misdiagnosis claims

A mole that has changed shape, colour or size scores three points on the seven-point checklist before it has even bled. Three points is the threshold for urgent dermatology referral. Yet most patients we act for had that exact mole called an age spot at the naked eye, without a dermoscope being used.

By the time a biopsy was finally taken, the lesion had grown deeper into the skin. A thin, curable melanoma had become an intermediate or thick one. Sentinel node surgery, scans and oncology clinics had replaced what should have been a single excision under local anaesthetic.

If that pattern matches your experience, our medical negligence team can tell you whether the delay amounts to a claim. We will review your records without obligation and act on a no win no fee basis. Our delayed cancer diagnosis work is recognised by Legal 500 2026 and Chambers UK 2026.

The checklist your GP should have used on a suspicious mole

NICE guideline NG12 tells GPs to use a structured assessment, not a glance, when a patient presents with a changing mole. The 7-point Glasgow checklist is the recognised tool.

Three findings count as major, scoring two points each: a change in the size of the mole, an irregular shape or border, and an irregular colour. Any one of these, in a lesion that an adult patient is worried about, is a serious finding.

Four findings count as minor, scoring one point each: a largest diameter of 7mm or more, inflammation, oozing or crusting, and a change in sensation such as itch or tenderness.

A score of three or more should trigger urgent referral on the two-week-wait suspected skin cancer pathway. So should any single feature that strongly suggests melanoma, regardless of the score. Many of the missed melanoma claims we run start with a GP entry that recorded one or more of these features and still sent the patient home.

We also see claims where a GP trained in dermoscopy did not use the dermatoscope, or used it and misread atypical pigment networks as benign. The Royal College of GPs and the British Association of Dermatologists both expect dermoscopy to be used by GPs trained in it. Over-reliance on naked-eye assessment, in a primary care setting where the tool was available, is a recognised pattern of substandard care.

Non-melanoma skin cancers still need to be taken seriously

Most of this page deals with melanoma because the consequences of delay are the most severe. But basal cell carcinoma (BCC) and squamous cell carcinoma (SCC) also generate claims, and they should not be dismissed as cosmetic problems.

BCCs rarely spread but can become locally destructive, particularly on the face, where a small lesion ignored for two years can require complex reconstructive surgery that a timely excision would have avoided. SCCs can metastasise, particularly when they arise on the lip, ear or in immunosuppressed patients. A persistent non-healing sore, a crusted lesion that keeps coming back, or a rapidly growing nodule is not “just a wart” and should prompt urgent dermatology review.

Breach and causation in a skin cancer claim

A poor outcome is not, on its own, a claim. We have to prove two things.

The first is breach of duty. The care you received has to be shown to have fallen below what a reasonably competent GP, dermatologist, pathologist or plastic surgeon would have provided. NICE NG12, the Glasgow 7-point checklist and the British Association of Dermatologists’ guidance are the benchmarks. A changing mole dismissed without dermoscopy, a Glasgow score of three or more that was not referred, a dermoscopic image showing atypia that was not biopsied, or a confirmed melanoma where the two-week-wait pathway was not actioned are each recognised breach patterns. Avoidable delays inside the dermatology service itself, after referral, also fall within scope.

The second is causation. Even where the care was substandard, you only have a claim if earlier diagnosis would have changed your prognosis or treatment. We instruct independent dermatologists, dermatopathologists and oncologists to compare the Breslow thickness, ulceration status and stage at the point your cancer should have been diagnosed with the stage at which it actually was. The deeper the tumour grew during the delay, the larger the gap in prognosis the law recognises.

How stage at diagnosis shapes treatment and prognosis

Stage governs what treatment can realistically achieve. Each millimetre of Breslow depth changes the conversation.

Caught in situ (Stage 0), melanoma is removed by wide local excision under local anaesthetic, with cure rates approaching 100 per cent. There is no need for scans, sentinel node surgery or oncology follow-up.

At Stage 1 or 2, treatment usually combines wider excision with a sentinel lymph node biopsy. Prognosis remains very good for most patients, though follow-up is more involved.

At Stage 3, where regional lymph nodes are involved, treatment commonly includes completion lymphadenectomy and adjuvant immunotherapy. The treatment burden is significant and the risk of recurrence material.

At Stage 4 metastatic disease, treatment shifts to systemic therapy. Immunotherapy drugs such as ipilimumab, pembrolizumab and nivolumab, and targeted BRAF inhibitors where the tumour carries the relevant mutation, have transformed outcomes for advanced melanoma over the past decade. Survival is far better than it once was, but the side-effect burden and clinical uncertainty are still real, and the cost in lost years and lost work is something a court is asked to recognise.

Where a delay has converted a survivable melanoma into a fatal one, we act for families in fatal medical negligence claims.

What drives melanoma and skin cancer compensation

Compensation in a skin cancer claim is calculated in two parts. General damages cover the pain, suffering and loss of amenity caused by the negligence. Special damages cover the financial losses that follow from it.

In practice that includes:

• Loss of earnings where treatment, recovery or advanced disease has stopped you working or shortened your working life.
• The cost of private treatment, including immunotherapy, targeted therapy, reconstructive surgery and scar revision, that you would not have needed had the cancer been caught earlier.
• Care, equipment and home adaptations needed because of advanced disease or treatment side effects.
• Travel costs for hospital appointments, scans and oncology clinics.
• Future losses, including pension shortfall and dependency claims where the prognosis is poor.

Our cancer misdiagnosis solicitors have recovered six-figure settlements in delayed cancer diagnosis claims. The figure in any individual case turns on the stage of cancer at the point of missed diagnosis, the stage at which it was eventually picked up, and the impact on your life and family.

What working with our medical negligence team looks like

Our work runs in three stages.

1. Initial review. You tell us what happened. We listen, ask questions and tell you honestly whether we think there is a claim worth investigating. There is no obligation at this stage.
2. Investigation. We obtain your full GP, dermatology, histopathology and oncology records, instruct an independent dermatologist to address standard of care, and instruct an oncologist to address what difference earlier diagnosis would have made to your prognosis. This work is funded under a no win no fee agreement, so you pay nothing if the claim does not succeed.
3. Resolution. Most skin cancer claims settle out of court once the medical evidence has been exchanged. If yours does not, our medical negligence solicitors will issue proceedings and take your case to trial.

You have three years from the date of the negligence, or the date you became aware that negligence may have caused you harm, to bring a claim. In melanoma cases, the second date often applies because the link between a dismissed mole and the eventual diagnosis only becomes clear once a later biopsy returns a melanoma result. We can advise on which date applies to your situation.

Your case will be led by Shivam Raja or another senior solicitor in the clinical negligence team. Several of our solicitors hold medical qualifications, which means we read histopathology reports, dermoscopy notes and oncology letters the way an expert witness would.

★★★★★

“I had the pleasure of working with Shivam Raja at Osbornes Law and I cannot speak highly enough of the experience. Shivam inherited my clinical negligence case at an early stage and demonstrated a level of professionalism, knowledge, and dedication that truly stood out.”

Speak to a skin cancer misdiagnosis lawyer today

If you believe your melanoma, BCC or SCC was missed, misdiagnosed or diagnosed too late, our cancer misdiagnosis lawyers will review your case in confidence and without obligation.

Call 020 7485 8811 or fill in the contact form below.