7 Early Signs of Skin Cancer You Should Never Ignore

Why Early Skin Changes Matter

Skin cancer can appear as a changing mole, a persistent sore, or a new bump, and it can develop on both sun-exposed skin and less-visible areas such as the soles or beneath the nails. Basal cell carcinoma and squamous cell carcinoma are common forms; melanoma is less common but more likely to spread. Mayo Clinic’s overview of skin cancer explains how these cancers can differ in appearance and risk.

Noticing a new, changing, or persistent spot gives you a reason to seek medical advice, not a basis for diagnosing it yourself. Many harmless conditions can resemble skin cancer, and some cancers do not cause pain or other obvious symptoms. A health professional can assess the area and decide whether further examination is needed.

The first seven items in the list below are prompts to pay attention and ask for professional guidance. They are not a checklist that can confirm or rule out cancer. For a new or changing spot that persists, MD Anderson recommends contacting a doctor, particularly if it itches, hurts, bleeds, or does not heal.

Skin Cancer Warning Signs

1. A new or changing spot that looks unlike a person’s other moles may be a warning sign, but appearance alone cannot diagnose skin cancer.
2. The ABCDE guide highlights asymmetry, irregular borders, varied color, diameter often around 6 millimeters or larger, and evolution; these are warning signs, not a diagnostic test.
3. A sore that does not heal or repeatedly reopens may warrant medical assessment; MD Anderson advises bringing a sore that has not healed within two weeks to a doctor’s attention.
4. Basal cell carcinoma may appear as a pearly, waxy, translucent, pink, or skin-colored bump; appearance can vary with skin tone.
5. A persistent rough, dry, scaly, or crusted patch can be a warning sign, although noncancerous conditions may look similar.
6. Skin cancer spots may itch, hurt, bleed, crust, or ooze, but many early skin cancers cause no discomfort and these symptoms do not confirm cancer.
7. A persistent or changing dark streak beneath a nail can be a melanoma warning sign; melanoma can also occur on palms, soles, and other areas with little sun exposure.
8. UV radiation from sunlight and indoor tanning devices can damage skin-cell DNA; risk factors also include a personal or family history of skin cancer, many or atypical moles, and a weakened immune system.
9. The three main skin cancer types are basal cell carcinoma, squamous cell carcinoma, and melanoma; melanoma is less common but more likely to spread.
10. A clinician can examine a suspicious lesion and may recommend a biopsy; arrange professional assessment for a new, changing, persistent, or concerning spot rather than relying on self-diagnosis.

1. A New Spot That Stands Apart

A new growth or mark that looks unlike a person’s other moles can be a warning sign of skin cancer. It may stand out because it is larger or smaller, lighter or darker, or simply different in shape or appearance. This comparison is sometimes called the “ugly duckling” sign.

A spot that stands apart does not necessarily mean cancer. Many skin growths are harmless, and appearance alone cannot confirm a diagnosis. Still, a new or changing mark that persists or causes concern should be assessed by a health professional, as advised in Mayo Clinic’s skin cancer guidance.

Seek an appropriate clinician’s advice instead of relying on comparisons or photographs alone.

2. A Mole Changing Over Time

A mole that changes in size, shape, color, or elevation deserves attention. The ABCDE guide can help people notice possible melanoma warning signs, but it is not a diagnostic test.

• Asymmetry: the two halves of the spot do not match.
• Border: the edges look uneven, notched, or blurred.
• Color: the spot has multiple shades or an uneven color.
• Diameter: a spot around 6 millimeters or larger may be concerning.
• Evolving: the mole changes in appearance or behavior, such as becoming raised, itchy, or prone to bleeding.

The 6-millimeter guide is not a cutoff. Melanomas can be smaller, and a mole does not need to show every ABCDE feature to warrant attention. The American Cancer Society’s melanoma warning signs also include changes such as pigment spreading beyond a spot’s edge or new tenderness.

A checklist can help you describe what has changed, but appearance alone cannot confirm or rule out skin cancer. If a mole is changing or looks unusual, arrange a professional assessment rather than waiting for it to match every warning sign. Concerns about a suspicious skin lesion should be assessed by a qualified medical professional.

3. A Sore That Will Not Heal

A sore, scab, or open area that lingers or repeatedly reopens may be a warning sign of skin cancer. It can seem to heal, then break down again, or continue to bleed or crust. Basal cell and squamous cell carcinomas can both appear as sores that do not heal, though other skin conditions can look similar.

A persistent sore deserves medical assessment, even if it is small or painless. MD Anderson advises bringing a sore that has not healed within two weeks to a doctor’s attention; appearance alone cannot confirm a diagnosis, and a clinician can decide whether further examination or a biopsy is needed (skin cancer symptoms and signs). See also what skin cancer can look like for examples of visible changes. Avoid waiting for the area to worsen before seeking professional advice.

4. A Pearly or Waxy Bump

A basal cell carcinoma may look like a pearly, waxy, translucent, pink, or skin-colored bump. Some have small visible blood vessels, a raised or rolled edge, or a center that bleeds or scabs. These growths often develop on sun-exposed areas, including the face, but they can occur elsewhere.

Color can vary with skin tone. On brown or Black skin, a basal cell carcinoma may appear brown or glossy black rather than pink or pearly, so a bump that does not match the familiar description should not be dismissed. The American Cancer Society’s overview of basal cell carcinoma notes that these cancers commonly develop on sun-exposed skin and can have different appearances.

A bump’s appearance alone cannot confirm skin cancer, and harmless growths may look similar. Arrange an evaluation for a new or changing bump, especially if it repeatedly bleeds, crusts, or fails to heal.

5. A Persistent Rough or Scaly Patch

A new or persistent rough, dry, red, pink, scaly, or crusted patch can be a sign of skin cancer, particularly if it does not settle or keeps returning. Some patches are associated with squamous cell carcinoma, but eczema, psoriasis, infections, and other noncancerous conditions can look similar. Appearance alone cannot confirm the cause, as MD Anderson explains.

Pay attention if a patch persists, grows, becomes tender, bleeds, or develops an irregular edge. These changes do not prove that a lesion is cancerous, but they are reasons to seek a clinician’s assessment rather than relying on appearance or home monitoring alone. Photos and examples in this guide to what skin cancer can look like may help explain the range of visible changes, but they cannot diagnose a spot.

6. A Spot That Itches, Hurts, or Bleeds

A skin cancer spot may itch, feel tender or painful, or bleed, crust, or ooze. These symptoms can occur with several types of skin cancer, but they can also have other causes, so they do not confirm a diagnosis.

Many early skin cancers cause no discomfort. A spot that feels normal is not necessarily harmless, and visual changes remain worth noticing. MD Anderson notes that some skin cancers have no noticeable symptoms in their early stages.

Arrange a medical assessment if a new symptom persists, or if itching, pain, or bleeding occurs alongside a change in a spot’s size, shape, color, or surface. A clinician can examine the area and decide whether monitoring or a biopsy is appropriate; appearance and sensation alone cannot establish what it is.

For a suspicious skin change, seek evaluation from a qualified medical professional rather than relying on self-diagnosis.

7. A Dark Streak Beneath a Nail

A persistent dark vertical streak beneath a fingernail or toenail can be a warning sign of melanoma, especially if it widens, changes, or pigment appears on the skin beside the nail. Not every streak is cancer, but a new or changing mark deserves medical assessment rather than self-diagnosis.

Melanoma can develop under a nail and in other areas that receive little or no sun, including the palms and soles. This means a skin check should include covered or less-visible areas, not only skin exposed to sunlight. The American Cancer Society’s melanoma signs include a dark line beneath a fingernail or toenail among changes to bring to a doctor’s attention.

An injury or other condition can also cause nail discoloration, so appearance alone cannot establish the cause. If a streak persists or changes, arrange an evaluation instead of waiting for pain or other symptoms.

Recognizing Skin Cancer Changes

What are the early signs of skin cancer?

Early signs of skin cancer can include a new or changing spot, a sore that does not heal, or a growth that bleeds, itches, or crusts. A spot that looks unlike your other moles also deserves attention. For melanoma, the ABCDE guide highlights asymmetry, an irregular border, varied color, diameter often around 6 mm or larger, and evolution in size, shape, color, or symptoms. These features are warning signs, not a diagnosis, and skin cancer can develop on areas that receive little sun. Mayo Clinic’s overview of skin cancer signs and causes advises seeking medical assessment when a change is concerning.

What can skin cancer look like in its early stages?

It may look like a pearly or waxy bump, a firm red nodule, a rough or scaly patch, or a sore that does not heal. Melanoma may begin as a new or changing mole. Because signs vary and similar changes can have noncancerous causes, appearance alone cannot confirm skin cancer. A suspicious skin lesion should be evaluated by a qualified medical professional.

How can you tell whether a spot is melanoma or another type of skin cancer?

You cannot reliably tell from appearance alone. A dermatologist can examine the area, sometimes with a dermatoscope, and may recommend a biopsy. A laboratory examines the sampled tissue under a microscope to determine whether cancer is present and identify its type. MD Anderson’s guidance on skin cancer symptoms and evaluation notes that persistent or changing spots warrant a clinician’s attention. A spot that worries you is a reason to arrange an assessment, not to self-diagnose.

Risk Factors and Cancer Types

Skin cancer develops when DNA changes cause skin cells to grow abnormally. Ultraviolet (UV) radiation from sunlight and indoor tanning devices can damage that DNA, and repeated exposure or sunburns can raise risk. Still, having risk factors does not mean a person will develop cancer.

Risk is higher for people with fair or sun-sensitive skin, a personal or family history of skin cancer, many or atypical moles, or a weakened immune system. Age and accumulated UV exposure also matter, but skin cancer can occur at any age and in people of every skin tone. It may develop on areas that receive little sun, so risk is not limited to visibly sun-exposed skin. Mayo Clinic’s overview of skin cancer causes and risk factors outlines these risks and the main cancer types.

The three main types differ in the cells they affect and how they behave. Basal cell carcinoma is the most common type and often grows slowly, but it can damage nearby tissue if left untreated; spread to other parts of the body is rare. Squamous cell carcinoma can appear as a firm, scaly, or crusted spot and may spread. Melanoma begins in pigment-producing cells. It is less common than basal and squamous cell carcinoma, but is more likely to spread and can be harder to treat.

Appearance alone cannot confirm which type a spot may be, or whether it is cancer. A clinician can examine a suspicious area and, when appropriate, take a biopsy for laboratory testing. A qualified medical professional should assess a suspicious lesion and determine whether biopsy or other evaluation is needed.

Symptoms and Possible Spread

Skin cancer can cause itching, tenderness, pain, bleeding, or a sore that does not heal or keeps returning. Many skin cancers cause no discomfort, so a spot’s appearance and changes over time matter as much as how it feels. These signs can also have other causes, and symptoms alone cannot diagnose cancer. Have a healthcare professional assess a persistent, bleeding, or changing area. MD Anderson’s overview of skin cancer symptoms describes warning signs and when to seek an evaluation.

Symptoms beyond the skin vary with the site of spread. Possible signs include swollen lymph nodes, a persistent cough or shortness of breath, unexplained pain, ongoing headaches, or new neurologic changes. A new lump or spot near the original lesion may also warrant attention. These symptoms have many possible explanations and do not, by themselves, show that melanoma has spread.

If you have a melanoma diagnosis and develop new or persistent symptoms, contact your clinician rather than trying to interpret them on your own. The clinician can consider your history, examine you, and decide whether further assessment is needed. Concerns about possible melanoma spread should be directed to the clinician managing the diagnosis.

Evaluation, Treatment, and Outlook

A suspicious skin change needs a professional assessment because appearance alone cannot confirm whether it is cancer. At a consultation, a clinician examines the area and may check nearby skin and lymph nodes. If the lesion looks concerning, a biopsy can provide tissue for examination under a microscope. MD Anderson’s overview of skin cancer symptoms and diagnosis describes monitoring, photographs, and biopsy as possible next steps.

Treatment depends on the cancer’s type, size, location, stage, and the person’s overall health. Many basal and squamous cell cancers are removed with standard surgery or Mohs surgery, which examines tissue in stages while aiming to spare nearby healthy skin. Depending on the diagnosis, other options may include treatments that destroy cancer cells, radiation, topical medicines, or photodynamic therapy. Melanoma or cancer that has spread may call for wider surgery or treatment that acts throughout the body.

Suspected skin cancer should first be assessed by a qualified medical professional. The clinician can explain which treatment is appropriate and coordinate care when needed.

Many skin cancers can be cured, especially when found and treated early, but no outcome can be promised for an individual. Basal and squamous cell cancers are often treatable, yet untreated growths can extend into nearby tissue and cause damage. Melanoma is more likely to spread and can become life-threatening. Mayo Clinic’s skin cancer guidance notes that some skin cancers can invade healthy tissue and spread to other parts of the body.

If a spot is new, changing, persistent, or otherwise concerning, arrange an assessment rather than waiting for it to worsen. A clinician can determine whether testing is needed and discuss what a confirmed diagnosis means for treatment and outlook.

When to Seek a Professional Assessment

Contact a healthcare professional about a new, changing, persistent, or unusual spot, especially if it grows, changes color or shape, bleeds, or does not heal. A clinician can examine the area and decide whether further assessment is needed. MD Anderson advises discussing a new or changing spot that persists, or a sore that has not healed, with a doctor.

Skin cancer can affect people of every skin tone and may develop on areas that receive little sun, including the palms, soles, and beneath the nails. Concerning skin changes should be assessed by an appropriate healthcare professional.

Warning signs are reasons to seek evaluation, not proof of cancer. Many harmless conditions can look similar, and appearance alone cannot confirm a diagnosis. If a spot concerns you, arrange a professional assessment rather than relying on self-diagnosis.