What skin cancer looks like on your skin
Skin cancer usually shows up as a new spot on your skin, or a change in a spot you've had for years. The spot might be a bump, a flat patch, a sore that won't heal, or a discolored area. It can be brown, black, red, pink, tan, or even skin-colored. Size varies — some are smaller than a pencil eraser, others larger.
The key is that it looks different from your other moles or spots, or it has changed in recent weeks or months. A spot that itches, bleeds, or feels tender is worth showing a doctor. So is one that has an uneven border, multiple colors, or a shiny or scaly surface.
Key Takeaways
- Skin cancer often appears as a new spot or a change in an existing mole, and may be brown, black, red, pink, or skin-colored.
- The ABCDE rule helps you spot concerning changes: asymmetry, border irregularity, color variation, diameter larger than a pencil eraser, and evolving (changing) appearance.
- A dermatologist can examine a suspicious spot in person and take a biopsy — a small tissue sample — to confirm whether it is cancer.
- Finding skin cancer early, when it is thin and has not spread, makes treatment simpler and outcomes better.
- You do not need a referral to see a dermatologist in most insurance plans, and many dermatologists can see new patients within weeks.
The ABCDE rule for spotting changes
Doctors use a simple checklist called the ABCDE rule to help people notice skin cancer early. If a spot has any of these features, it warrants a doctor's look:
- Asymmetry: One half of the spot does not match the other half. Draw an imaginary line through the middle — if the two sides look different, that is asymmetry.
- Border: The edge is jagged, notched, or blurry instead of smooth and even.
- Color: The spot has more than one color — for example, brown and black together, or tan and red.
- Diameter: The spot is larger than a pencil eraser (about 6 millimeters across).
- Evolving: The spot has changed in size, shape, or color over weeks or months.
Not every spot that fails the ABCDE rule is cancer, and not every cancer follows it perfectly. But if you notice any of these changes, scheduling a skin check is the next step.
Where skin cancer usually appears
Skin cancer can grow anywhere on your body, but it shows up most often on skin that gets sun exposure. That includes your face, ears, neck, scalp (if you have thinning hair), shoulders, chest, arms, and the backs of your hands and legs.
It can also appear in places that rarely see sun — between your toes, on your palms, under your nails, or on your genitals. Skin cancer in these spots is less common but can be more serious because people often notice it later. If you spot an odd mark anywhere on your body, a doctor can tell you whether it needs closer attention.
What a dermatologist does to check a spot
A dermatologist is a doctor who specializes in skin. During an exam, they will look at the spot with their eyes and often with a magnifying tool called a dermatoscope. They will ask how long you've had it, whether it has changed, and whether it itches or bleeds.
If the spot looks suspicious, the dermatologist will usually perform a biopsy — they remove a small piece of skin and send it to a lab. A pathologist (a doctor who studies tissue under a microscope) examines it and tells you whether cancer cells are present. The biopsy itself takes a few minutes and leaves a small mark that fades over time.
Results typically come back within one to two weeks. If cancer is found, the report will name the type — melanoma, basal cell carcinoma, or squamous cell carcinoma — and describe how deep it goes. That information guides the next steps.
When to schedule a skin check
See a dermatologist as soon as you notice a new spot that looks odd, or an existing mole that has changed. You do not need to wait for it to grow larger or to cause pain. Early detection makes a real difference in outcomes.
If you have many moles, fair skin, a family history of skin cancer, or a history of sunburns, ask your primary care doctor about scheduling regular skin checks — usually once a year. Some dermatologists offer full-body exams where they photograph your moles and track changes over time.
Most dermatologists can see new patients within two to four weeks. You typically do not need a referral from your primary care doctor, though some insurance plans require one — check your plan or call the dermatology office to ask.
What happens if skin cancer is found
If the biopsy shows cancer, your dermatologist will discuss treatment options. For most early skin cancers, the treatment is straightforward: the dermatologist removes the spot and a small margin of surrounding skin to make sure all cancer cells are gone. This is often done in the office under local anesthesia (numbing medicine).
The removed tissue is sent to the lab again to confirm that the margins are clear — meaning no cancer cells remain at the edges. If they are clear, no further treatment is needed for that spot. Your dermatologist will schedule follow-up visits to watch for new spots and to check the scar.
If the cancer is deeper or more extensive, or if it is melanoma, additional imaging or treatment may be needed. Your dermatologist will explain what applies to your situation and refer you to other specialists if necessary.
Reducing your risk going forward
After skin cancer is treated, protecting your skin from sun damage helps prevent new cancers from forming. That means wearing sunscreen with SPF 30 or higher every day, seeking shade during peak sun hours (10 a.m. to 4 p.m.), and wearing protective clothing like hats and long sleeves when you are outside for extended periods.
Check your own skin once a month — many people do this after a shower, when their skin is clean and dry. Use a mirror and ask a partner or family member to check spots on your back and scalp that you cannot see. Keep track of any new spots or changes, and bring photos to your dermatologist if you notice something between appointments.
Frequently Asked Questions
Can a spot be skin cancer if it does not hurt or itch?
Yes. Most skin cancers do not cause pain or itching. Many people discover them by noticing a change in appearance — a new bump, a spot that has grown, or a mole that has changed color. Pain or itching can be a sign, but the absence of these symptoms does not mean a spot is safe.
What is the difference between a mole and skin cancer?
A mole is usually a small, round, flat or slightly raised spot that has been on your skin for years and does not change. Skin cancer often appears as a new spot, or as a change in an existing mole — a shift in color, size, or shape over weeks or months. A dermatologist can tell the difference by examining it.
Do I need to see a dermatologist or can my primary care doctor check it?
Your primary care doctor can examine a spot and refer you to a dermatologist if they think it needs closer attention. However, dermatologists have specialized training in skin conditions and have better tools for diagnosis. If you are unsure, asking your primary care doctor for a referral is a reasonable first step.
How long does it take to get a biopsy result?
Most biopsy results come back within one to two weeks. The dermatology office will call you with the result, or you may see it in your patient portal if your health system has one. If you have not heard back after two weeks, call the office to check on the status.
If I had skin cancer once, will I definitely get it again?
Not necessarily, but your risk is higher than someone who has never had it. People who have had skin cancer are more likely to develop a new spot in the future. Regular skin checks and sun protection reduce that risk. Your dermatologist will recommend how often you should return for follow-up exams.