Skin Cancer Doesn’t Look Like You Think

Most people think they know what skin cancer looks like. An ugly, dark mole. Something that happens to older people who spent too long in the sun. Something your doctor will catch at your yearly check.

As a dermatologist and Mohs surgeon, I can tell you skin cancer often looks nothing like that.

I don't say this to scare anyone. But I've seen skin cancers that looked like pimples, patches of eczema, scars, and spots so subtle that the patient had been carefully watching every other mole on their body while overlooking the one that mattered.

Here are the five myths I hear most, and what I'd actually do.

Myth 1: Skin cancer means melanoma

Melanoma is the one everyone has heard of, and the one people fear most. Fair enough. But it's not the one I see most often.

There are three main types to know. Basal cell carcinoma is the most common. Textbooks describe it as a pearly, shiny bump, but as one of my teachers used to say, skin conditions don't read the textbook. It can look like a pimple that never quite heals, or a small rash that won't go away. It grows slowly and very rarely spreads, but left alone it keeps growing deeper, and because it favours the nose, ears and eyelids, even a modest one can turn into a bigger surgery than it needed to be.

Patients often ask me, "Will this kill me if I leave it?" Usually, honestly, no. But losing part of your nose won't kill you either. That doesn't make it unimportant.

Squamous cell carcinoma tends to be rougher, scalier or crusted. It can look like a wart, a sore that won't heal, or a firm, tender bump, and some grow surprisingly fast. It has a real ability to spread, especially when it's large, deep, on the face, or in someone with a weakened immune system.

Melanoma is less common but spreads more readily. And it isn't always dark. It can be pink, red, blue or close to skin-coloured. It can look like a bump, a sunspot you've had for years, a brown line in a nail, or a bruise-like mark on the sole of your foot.

Myth 2: I'm not the type to get skin cancer

"I don't burn." "I'm young." "No one in my family has had it."

Fair skin, light eyes and burning easily do raise your risk. But so do cumulative sun, blistering burns, any indoor tanning, lots of moles, a personal or family history, and a weakened immune system. If you've already had one skin cancer, your chance of another within a few years is substantial.

Darker skin means lower risk, not no risk.

And UV adds up. I often hear, "But I've worn sunscreen every day for years." Then I ask about childhood, and the answer is usually something like, "Oh, that was different. Baby oil and a reflector."

Myth 3: It always looks like an ugly dark mole

This is the most dangerous myth, because it makes people focus on the wrong spots.

Instead of picturing what cancer "should" look like, I look for three things:

• Anything new and changing. Growing, changing shape or colour, getting more raised.
• Anything that bleeds on its own or won't heal. A spot that keeps opening up, crusting and coming back.
• Anything that looks different from everything else. We call it the ugly duckling.

For brown, mole-like spots, the ABCDE rule still helps: asymmetry, irregular border, uneven colour, diameter larger than a pencil eraser, and evolution. If you remember one letter, make it E. Change is the biggest red flag.

Myth 4: My doctor will find it

Thank you for the confidence. But this really has to be a team effort.

In one large study of nearly 2,500 people with melanoma, close to half were first noticed by the patients themselves, about as many as doctors found. You're the one who sees your skin every day.

Your job isn't to diagnose. It's to notice something new, changing or different, and get it looked at.

How I'd do it: a full self-check every one to three months, not every morning. Checking daily actually makes slow changes harder to see, like watching paint dry. Use good light and a full-length mirror, and check front, back and sides. Don't skip your scalp, between your toes, the soles of your feet, or places the sun never reaches. Ask a partner to check your back. And take clear photos of anything you're watching, with the same light and distance each time. A blurry photo doesn't help anyone. If you have many moles or a strong history, ask about mole mapping, which tracks your spots over time with standardized photos.

Myth 5: It's easy to remove, so it's no big deal

I treat skin cancer every day, so I understand where this comes from. Most basal and squamous cell cancers are very curable.

But curable and minor aren't the same thing. Skin cancer is often bigger under the surface than it looks on top. On the nose, eyelid, lip or ear, removing it can affect both how you look and how things work. That's where techniques like Mohs surgery, which checks the edges under the microscope during the procedure, aim to remove the cancer while sparing as much healthy skin as possible.

The reason most skin cancers are curable is that most are caught early. Melanoma found before it spreads to the lymph nodes has around a 99% five-year survival. Once it has spread to distant organs, it's a very different conversation.

Catching it early is the whole game.

What I'd do

If you find something new, changing, bleeding or not healing, especially if it doesn't look like your other spots, get it checked by your doctor or a dermatologist. Don't wait for it to look the way you imagine cancer looks. It might never look like that.