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Scientists Discover Way to Send Information into Black Holes Without Using Energy

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Scientists Create “Smart Tattoo” That Detects Skin Cancer In Just 4 Days Before It Becomes Visible

Skin cancer is one of the most common forms of cancer in the world, and melanoma is its deadliest type. Doctors have long known that early detection can save lives. But there has always been one major problem: the smallest and most dangerous melanomas are often invisible in their earliest stages.

Now, researchers in Canada may have found a breakthrough solution.

Scientists from the Institut national de la recherche scientifique (INRS), working with researchers from Université de Montréal (UdeM), have developed a futuristic new technology called SMEAR-ULM that can detect melanoma before it becomes visible to the human eye.

The new system works by measuring tiny heat changes on the surface of the skin using microscopic needles and glowing nanoparticles. Researchers say the technology could help doctors identify aggressive skin cancers earlier, reduce unnecessary biopsies, and improve survival rates.

Their findings were recently published in the scientific journal Nature Sensors.

Why Early Melanoma Detection Matters

Melanoma develops in the pigment-producing cells of the skin. Although it is less common than other skin cancers, it spreads much faster and can become life-threatening if not treated early.

In Canada and many other countries, melanoma cases are steadily increasing every year. Doctors usually detect suspicious spots through visual examination and then confirm the diagnosis with a biopsy.

But this method has limitations.

Very small melanomas are often missed because they are difficult to see. Many harmless skin spots are also biopsied unnecessarily, causing stress, discomfort, and extra medical costs.

According to the researchers, this is exactly the problem SMEAR-ULM was designed to solve.

“Our goal is to provide a minimally invasive tool to detect very small, but still aggressive melanomas,” explained Professor Jinyang Liang, the senior author of the study and an expert in ultrafast imaging and biophotonics at INRS.

He said that these tiny melanomas are often ignored during normal clinical inspections because of their size, allowing dangerous cancers to grow unnoticed.

Turning Heat Into a Cancer Signal

Scientists have known for years that tumors generate more heat than normal tissue. Cancer cells consume more oxygen and nutrients, increasing their metabolic activity and producing extra warmth.

However, traditional thermal imaging systems have not been sensitive enough to use this heat difference reliably.

Conventional infrared cameras often produce blurry images with high background noise. Most existing thermal imaging systems can only detect tumors larger than 5 millimeters — cancers already visible to the naked eye.

SMEAR-ULM changes that completely.

The new technology transforms tiny temperature changes into a highly precise diagnostic signal.

Instead of relying on standard infrared cameras, the researchers created a sophisticated optical system capable of detecting extremely small thermal variations with remarkable accuracy.

The “Smart Tattoo” Under the Skin

At the center of the system is a tiny patch of painless microneedles.

These microscopic needles place specialized nanoparticles just beneath the skin’s surface. The nanoparticles create what researchers describe as a temporary “intelligent tattoo.”

This tattoo is invisible and acts like a network of microscopic thermometers spread across the skin.

When the area is exposed to near-infrared light, the nanoparticles glow by emitting visible light. But the important detail is not the brightness of the light — it is how long the glow lasts.

The duration of the light emission changes depending on temperature.

Because cancer cells generate extra heat, the nanoparticles near a melanoma behave differently from those near healthy tissue. By carefully analyzing these tiny changes, scientists can create a detailed temperature map of the skin.

The result is an incredibly sensitive method for spotting cancer long before it becomes visible.

A High-Speed Imaging Breakthrough

The system uses an ultrafast imaging technique to capture all the thermal information in a single snapshot.

This allows researchers to instantly generate highly detailed thermal maps with submillimeter precision and temperature sensitivity smaller than one degree.

INRS graduate student Yingming Lai, the study’s first author, explained why this matters.

“We capture all the necessary information for an instantaneous temperature map in a single shot,” Lai said.

Because the process is so fast, the system can continuously monitor tiny abnormal heat patterns even in complex living conditions.

This makes the method far more practical and reliable than older technologies that required repeated measurements over time.

Detecting Melanoma Just Four Days After Formation

One of the most impressive achievements of the study was how early the technology could identify cancer.

Using mouse models that closely mimic human melanoma genetics, the researchers successfully detected micro-melanomas only four days after they formed.

At that stage, the tumors are far too small to be seen using normal imaging tools or visual skin examinations.

Professor Sylvain Meloche from Université de Montréal, who co-led the research, emphasized the importance of this achievement.

Although the experiments were performed in mice, he said the model reproduces the same genetic changes found in human melanoma, meaning the technology could eventually benefit patients in real clinical settings.

Detecting cancer this early could dramatically improve treatment outcomes because melanoma becomes much more dangerous after it spreads deeper into the skin or to other organs.

Less Painful and More Accurate Diagnosis

Current melanoma diagnosis often involves cutting suspicious spots from the skin for biopsy testing.

While biopsies are essential, many turn out to be unnecessary because the lesions are harmless.

SMEAR-ULM could reduce these unnecessary procedures by giving doctors a rapid, noninvasive way to evaluate suspicious skin areas before deciding on surgery or biopsy.

The system is also minimally invasive because the microneedles are extremely small and designed to cause little or no pain.

Researchers believe this approach could improve patient comfort while also helping dermatologists make more accurate decisions.

More Than Just Skin Cancer

The scientists say the technology’s potential goes far beyond melanoma detection.

The nanoparticle platform could be modified to detect other biological signals inside the body, including changes in pH levels or ion concentrations.

This means the same technology could eventually help doctors study inflammation, infections, wound healing, or other diseases linked to subtle chemical or thermal changes.

In other words, SMEAR-ULM may become part of a new generation of biomedical imaging tools capable of monitoring the body in ways that were previously impossible.

A Glimpse Into the Future of Cancer Detection

Although the technology still needs further testing before being used in hospitals, researchers are optimistic about its future.

The combination of microneedles, nanoparticles, and ultrafast imaging represents a major advance in noninvasive cancer diagnostics.

Most importantly, it addresses one of the biggest challenges in melanoma treatment: finding dangerous cancers before they become visible.

If future human trials are successful, doctors may one day use temporary “smart tattoos” to scan patients for hidden cancers in minutes — without surgery, pain, or waiting for biopsy results.

For millions of people at risk of skin cancer, that future could save countless lives.

Reference: Lai, Y., Argüello, A.N., Liu, M. et al. Single-shot microneedle-encoded upconversion lifetime mapping for real-time in vivo thermo-dermoscopy. Nat. Sens. (2026). https://doi.org/10.1038/s44460-026-00078-4

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