Australian Doctor Shows 'Worst' Skin Cancer He's Ever Seen In Alarming TikTok Clip

A doctor has posted a shocking clip showing what he says is the ‘worst’ skin cancer case he’s ever come across in his medical career.

Skin cancer happens to be one of the most frequently diagnosed cancers in the United States. According to the American Academy of Dermatology Association, around one in every five Americans will end up developing the disease during their lifetime.

Melanoma, which is the deadliest form of skin cancer, actually only accounts for about one percent of all skin cancer cases in the country. Most cases are classified as basal or squamous cell carcinomas, which are far more common.

The NHS says people should keep an eye out for changes in their skin, especially when it comes to moles or the sudden appearance of new ones.

Dr. John O'Bryen, better known on TikTok as 'skincaredoctor', has taken to social media to educate people about the dangers of skin cancer. He’s been helping folks recognize the warning signs, including the ones that aren't always easy to spot.

Dr. O'Bryen, who works at Body Scan Skin Cancer Clinic in Australia, pointed out that not every melanoma shows up looking like a freckle or mole. In fact, in one of his most alarming videos yet, he showed what he believes is the worst case of skin cancer he’s ever diagnosed.

Skin cancer is one of the most common cancers in the US Getty Images

In the video, Dr. O’Bryen explains, "A man came to me last week, concerned about a new lump on his arm. It was red and had been quickly growing in size."

He then gave viewers a disturbing close-up of the area using a tool called a dermatoscope. The footage revealed a pink and white spot that looked very unusual.

Dr. O’Bryen shared that the spot measured 4mm when evaluated with the Breslow thickness scale. This scale is used by medical professionals to determine how deep the melanoma has grown beneath the surface of the skin.

On the surface, it looked like a slightly raised red bump. But when viewed under magnification, it showed white polarising lines and something called polymorphous vessels—both signs of concern.

The cancer under the microscope @‌skincancerdoctor/TikTok

Dr. O’Bryen quickly confirmed the diagnosis was a nodular melanoma. He emphasized that this particular type is especially dangerous because it tends to grow fast and carries the highest risk of fatality if not caught early.

According to the Cleveland Clinic, nodular melanomas typically appear as firm, raised growths on the skin. They’re often discolored and can be mistaken for a blood blister. In some cases, they can sting, itch, or even bleed.

These growths can look dome-shaped and might feel smooth or have a rough, crusty texture. The clinic compares the rougher types to the feel of a cauliflower, which makes them even harder to ignore once noticed.

What makes this type of melanoma even trickier is that it grows not just on the surface, but also deep below the skin. Most of the tumor’s mass is actually hidden underneath, sort of like how most of an iceberg sits beneath the waterline.

Nodular melanoma is considered the second most common form of melanoma. It accounts for about 15 to 20 percent of total melanoma cases diagnosed.

This aggressive form of cancer is also responsible for nearly half of all deaths caused by melanoma.

In the caption that went along with his now-viral video, Dr. O’Bryen added: "Scary! Not all melanomas are brown and black!"

How it looked from the surface @‌skincancerdoctor/TikTok

"I performed an excisional biopsy of this and the patient will see a melanoma surgeon and medical oncologist."

He also mentioned that his go-to tool, the Heine Delta 30 Pro dermascope, has been a game-changer in helping him diagnose skin cancers accurately. With this device, he managed to identify and treat 1,000 patients just last year alone.