What Are Your Legal Options When a Changing Mole Isn’t Biopsied

Most people know the warning signs by now. A mole that is changing shape, growing, bleeding, or just looks different from everything else on your skin is supposed to get checked. Often it does get checked.

The problem is what happens next. A doctor looks at it, says it is probably nothing, and sends the patient home without a biopsy.

Months or years later, that same spot turns out to be melanoma, often at a far more dangerous stage than it would have been if someone had taken a tissue sample the first time the patient asked about it.

If this happened to you or someone in your family, here is why these cases happen, what the medical standards require, and what your options look like under New York law.

Why Catching Melanoma Early Matters So Much

Few cancers change as dramatically with timing. According to the American Cancer Society's survival data, melanoma that has not spread beyond the skin where it started has a five-year relative survival rate above 99 percent. Caught at that stage, it is often cured with a fairly simple surgical excision.

The numbers fall quickly once it spreads. If melanoma reaches nearby lymph nodes or structures, five-year survival drops to 76 percent. If it reaches distant organs such as the lungs, liver, or brain, survival falls to 36 percent. That gap is why a delayed biopsy is not just an inconvenience.

It can be the difference between an outpatient procedure and years of immunotherapy, targeted drugs, and uncertainty. The longer a suspicious mole goes without a biopsy, the more time the cancer has to grow deeper into the skin and spread.

What Doctors Are Supposed to Look For

Clinicians evaluate suspicious moles using the ABCDE rule, which the American Cancer Society describes this way: asymmetry, where one half does not match the other; borders that are irregular, ragged, or blurred; color that varies across the spot; a diameter larger than 6 millimeters, about the size of a pencil eraser; and evolution, meaning the mole is changing in size, shape, or color.

ACS calls a new spot, or one that is changing in size, shape, or color, the most important warning sign of all. It also flags the "ugly duckling" sign, a mole that looks different from the others on your body, along with a sore that will not heal, itching or tenderness, and a mole that starts to scale, ooze, or bleed.

That focus on change matters a great deal in a legal case. When a patient tells a doctor that a mole has been changing or has started bleeding, that report is a clinical signal to act, not a cue for reassurance. It does not matter that the spot looks small or unremarkable. A documented report of change generally calls for a biopsy or a referral to a dermatologist.

Why "It Looked Fine" Is Not Always Enough

Some melanomas do not follow the ABCDE pattern at all. Nodular melanoma and amelanotic melanoma, two less common but dangerous subtypes, can be symmetric, a single uniform color, and relatively small. Melanomas can also start under a nail, on the palms or soles, or in places that are not exposed to the sun, and ACS notes that they may look different there. Even the diameter guideline has exceptions; ACS points out that melanomas are sometimes smaller than 6 millimeters.

A clinician who relies only on the checklist can end up reassuring a patient about a lesion whose lack of textbook features is exactly what makes it easy to miss. When a lesion is changing, and especially when the patient is the one reporting the change, it needs a closer evaluation than a quick look. Skipping a biopsy based on appearance alone can become the basis for a malpractice claim when it turns out to be the wrong call.

Why the Type of Biopsy Matters

A biopsy is not just a yes-or-no test. The pathologist also measures how deeply the melanoma has grown into the skin, known as Breslow thickness, which drives staging and treatment decisions. If the sample is too shallow, that measurement may be impossible.

ACS's guide to tests for melanoma says an excisional biopsy, which removes the entire suspicious area with a small margin of normal skin, is usually the preferred method for a suspected melanoma. A shave biopsy can be used, but when melanoma is a real possibility the blade has to go deep enough to get below the lesion. A superficial shave that leaves the base of the tumor behind can make the cancer impossible to stage accurately.

What Counts as Medical Malpractice in New York

A malpractice claim in New York has to show two core things: that the provider's care departed from accepted medical practice, and that the departure was a substantial factor in causing real harm.

In a missed melanoma case, the first question is what a reasonably careful doctor would have done with the same mole, the same patient complaint, and the same risk factors. If the answer is a biopsy or a referral, and neither happened, that is the departure.

Causation is where many melanoma claims rise or fall. It is not enough to show that a biopsy should have been done. The claim also has to show that the delay made a meaningful difference, usually because the cancer grew deeper or spread during the time it went undiagnosed.

That is why the Breslow measurement and staging records are central. Experts compare the stage the melanoma likely was at when it should have been caught with the stage it had reached when it finally was.

New York requires expert testimony on both points in nearly every malpractice case. A dermatologist, dermatopathologist, or oncologist typically has to review the records and explain what should have happened and what the delay cost.

How Long Do You Have to File in New York?

Under CPLR 214-a, the general deadline for a malpractice lawsuit is two years and six months from the act or omission. If you kept seeing the same doctor or practice for ongoing treatment of the same condition, the clock may not start until that treatment ends.

Melanoma cases often benefit from a special rule added in 2018, commonly called Lavern's Law. It is named for Lavern Wilkinson, a Brooklyn mother whose lung cancer was missed until it was too late to treat. For a claim based on a negligent failure to diagnose cancer, the two-and-a-half-year period runs from the later of two dates: when you knew or reasonably should have known of the negligent act and the harm it caused, or the date of your last continuous treatment. The discovery rule has an outer limit of seven years from the negligent act.

This matters because a patient usually has no way of knowing a mole was mishandled until the melanoma shows up, sometimes years after the missed chance to biopsy it. If you were told a mole was fine years ago and only recently learned it was melanoma, you may have more time than you think.

If the missed diagnosis happened at a public hospital or clinic, such as one run by NYC Health + Hospitals or a county, a formal notice of claim generally must be served within 90 days under General Municipal Law § 50-e. That window is far shorter than the ordinary deadline, so anyone treated at a public facility should talk to a lawyer quickly.

What Happens Before a Case Is Filed

These cases almost always start with a medical record review. An attorney will want the original visit notes, any photos or measurements of the lesion, pathology reports from any biopsy, and the records from the eventual diagnosis, so the timelines and staging can be compared.

New York also requires a certificate of merit under CPLR 3012-a. Before filing, the attorney must certify that they reviewed the case and consulted at least one physician, and concluded there is a reasonable basis for the claim. That step filters out weak claims, but it also means a careful medical review happens early, which can clarify exactly what went wrong. You can read about other cancers we handle and our clients' stories to see how these cases develop.

What Compensation Can Cover

Every case is different, but a melanoma misdiagnosis claim in New York can account for the cost of additional treatment made necessary by the cancer's progression, lost income during treatment and recovery, and pain and suffering tied to more invasive procedures or a worse prognosis. In the most serious cases, surviving family members may bring a wrongful death claim. The value depends heavily on the gap between how advanced the cancer should have been when caught and how advanced it actually was.

Talk With a New York Cancer Lawyer

A missed melanoma often comes down to a simple, devastating gap: a patient raised a concern, a provider looked, and no biopsy or referral ever followed. With survival above 99 percent when melanoma is caught early, that gap can change everything. Porter Law Group's New York cancer lawyers work with board-certified medical experts to review these timelines, and you can see our results in delayed cancer diagnosis cases. Call 833-888-LATE or request a free case evaluation.

Attorney advertising. This article provides general information and is not legal or medical advice. Prior results do not guarantee a similar outcome. Filing deadlines depend on the facts of each case.

Frequently Asked Questions

Should a doctor biopsy a mole that is changing?

In most cases, yes. The American Cancer Society calls a new or changing spot the most important warning sign of melanoma. When a patient reports that a mole is growing, changing color, itching, or bleeding, the accepted response is a biopsy or a referral to a dermatologist, not reassurance based on how it looks.

Can melanoma be misdiagnosed as a normal mole?

Yes. Some melanomas, including nodular and amelanotic types, can be symmetric, one color, and smaller than 6 millimeters, so they do not fit the classic ABCDE warning signs. Pathologists can also misread a biopsy sample as a benign atypical mole. Either error can delay diagnosis while the cancer grows deeper.

Can a shave biopsy miss or understage melanoma?

It can. Staging depends on measuring how deeply the melanoma has grown, called Breslow thickness. If a shave biopsy is too shallow and leaves the base of the tumor behind, that measurement may be impossible. The American Cancer Society says an excisional biopsy is usually preferred for a suspected melanoma.

Can I sue for a missed melanoma diagnosis in New York?

You may be able to if a doctor failed to biopsy or refer a suspicious mole that a reasonably careful provider would have acted on, and the delay let the cancer grow or spread. A physician must review your records, and your attorney must file a certificate of merit before the case begins.

How long do I have to file a missed melanoma claim in New York?

Under Lavern's Law, part of CPLR 214-a, you generally have two years and six months from when you knew or should have known of the mistake and the harm it caused, or from your last continuous treatment. The outer limit is seven years from the missed biopsy. Public hospitals require a notice of claim within 90 days.