Your skin can reveal important clues about your health. A mole that suddenly changes shape, a sore that refuses to heal, or an unusual patch of discolored skin may seem harmless at first. But sometimes, these changes are your body’s way of signaling that something needs medical attention.
As we get older, our skin naturally changes. Wrinkles become more noticeable, age spots appear, and the skin may become thinner or drier.
Most of these changes are completely harmless.
However, certain symptoms can be associated with skin cancer, infections, autoimmune disorders, or other medical conditions.
The key is knowing which changes deserve closer attention.
Here are five important skin warning signs, particularly for adults over 50.
1. A Mole That Changes Shape, Size, or Color
One of the most important skin changes to watch for is a mole that begins looking different.
Most adults have moles, and the majority are benign. However, a new or changing mole can sometimes be an early warning sign of melanoma, a potentially dangerous form of skin cancer.
Melanoma develops in melanocytes, the cells responsible for producing skin pigment.
Although melanoma accounts for a smaller proportion of skin cancers, it causes a disproportionate number of skin cancer deaths because it can spread to other organs.
The ABCDE warning signs of melanoma
Dermatologists often recommend using the ABCDE rule to identify suspicious changes.
A
Asymmetry
B
Border
C
Color
D
Diameter
E
Evolving
- A — Asymmetry: One half of the mole looks different from the other.
- B — Border: The edges appear irregular, blurred, or poorly defined.
- C — Color: The mole contains multiple colors or develops uneven pigmentation.
- D — Diameter: Melanomas are often larger than 6 millimeters when diagnosed, although they can be smaller.
- E — Evolving: The mole changes in size, shape, color, elevation, or symptoms over time.
Of these signs, evolving or changing appearance is especially important.
A mole that starts itching, bleeding, or developing a crust should also be examined.
What about a completely new mole?
New moles can develop in adulthood, but a new pigmented lesion appearing later in life deserves particular attention.
Melanoma can also develop in areas that receive relatively little sunlight, including the soles of the feet, underneath fingernails, and between the toes.
People with darker skin tones can develop melanoma too, including on palms, soles, and nail beds.
If a mole is changing or looks significantly different from your other moles, arrange a dermatology examination.
2. A Sore That Doesn’t Heal After Several Weeks
Have you ever noticed a small wound, scab, or irritated patch that seems to heal and then repeatedly returns?
A persistent sore can sometimes be a warning sign of skin cancer.
Two common types of skin cancer are basal cell carcinoma and squamous cell carcinoma.
Basal cell carcinoma
Basal cell carcinoma is the most common type of skin cancer.
It may appear as a shiny or pearly bump, a pink or reddish patch, a scar-like area, or a sore that bleeds and repeatedly scabs over.
These cancers often develop on sun-exposed areas such as the face, ears, scalp, and neck.
Basal cell carcinoma usually grows slowly and rarely spreads to distant organs, but it can damage surrounding tissue if left untreated.
Squamous cell carcinoma
Squamous cell carcinoma may appear as a rough, scaly patch, a firm bump, or a sore that doesn’t heal.
Some lesions become tender, crusted, or prone to bleeding.
This type of cancer can sometimes spread, especially when diagnosed at an advanced stage or when certain high-risk features are present.
When should you worry?
A skin lesion that persists for several weeks, repeatedly bleeds, or keeps reopening should be assessed by a healthcare professional.
Not every slow-healing wound is cancer.
Diabetes, poor circulation, infection, and certain medications can also interfere with healing.
However, an unexplained wound that doesn’t improve should not be dismissed.
3. Dark, Velvety Patches Around the Neck, Armpits, or Groin
Sometimes, the skin develops darkened, thickened patches with a soft, velvety texture.
These patches most commonly appear around the neck, armpits, groin, or other skin folds.
The condition is known as acanthosis nigricans.
It is not contagious, and the darkened skin is not caused by poor hygiene.
What causes it?
Acanthosis nigricans is often associated with insulin resistance, a condition in which the body’s cells do not respond normally to insulin.
Insulin resistance can occur in people with obesity, prediabetes, type 2 diabetes, and polycystic ovary syndrome.
Certain medications and hormonal conditions may also contribute.
Rarely, acanthosis nigricans can be associated with an internal cancer, particularly when it appears suddenly, spreads rapidly, or is unusually extensive in an older adult.
That association is uncommon, and most people with acanthosis nigricans do not have cancer.
What should you do?
If you notice new dark, thickened patches, a doctor may recommend checking your blood sugar and reviewing other possible causes.
Sudden, widespread changes warrant more prompt evaluation.
Avoid aggressive scrubbing or using harsh skin-lightening products without medical guidance, because these can irritate the skin without addressing the underlying cause.
4. Unexplained Red, Purple, or Pinpoint Spots
Red or purple spots can develop for many reasons, ranging from minor irritation to medical conditions that require urgent attention.
One important distinction is whether the spots fade when you press on them.
Tiny red, purple, or brownish spots caused by bleeding beneath the skin are called petechiae.
Larger areas of bleeding under the skin may be called purpura.
What can cause these spots?
Possible causes include infections, medications, platelet disorders, blood vessel inflammation, or physical strain.
Older adults may also develop purple bruising on the forearms and hands because aging and long-term sun exposure make blood vessels and supporting skin tissue more fragile.
This is sometimes called senile purpura or actinic purpura and is often benign.
However, new unexplained pinpoint spots or widespread bruising should not automatically be attributed to aging.
When is it an emergency?
A new rash that does not fade under pressure, especially when accompanied by fever or feeling seriously unwell, requires emergency medical assessment.
Seek immediate help if the spots appear with confusion, severe headache, neck stiffness, difficulty breathing, or rapidly worsening illness.
These symptoms can occasionally occur with serious infections or blood-related emergencies.
A doctor may recommend blood tests or other investigations depending on the circumstances.
5. Persistent Rough, Scaly, or Crusty Patches
A rough patch that feels like sandpaper may seem like ordinary dry skin.
But some persistent scaly lesions are caused by actinic keratosis, a condition associated with years of ultraviolet radiation exposure.
Actinic keratoses commonly develop on areas that receive frequent sunlight, including the face, scalp, ears, forearms, and backs of the hands.
They may appear pink, red, brown, or similar to the surrounding skin tone.
Some are easier to feel than to see.
Why does actinic keratosis matter?
Actinic keratosis is considered a precancerous skin lesion.
Some lesions can develop into squamous cell carcinoma, although many never progress.
It is not possible to reliably predict which individual lesions will become cancerous simply by looking at them.
Dermatologists may recommend treatment with cryotherapy, prescription creams, photodynamic therapy, or other approaches.
Could it be something else?
Yes. Eczema, psoriasis, fungal infections, and other inflammatory skin conditions can also produce scaly patches.
That is why persistent or changing lesions should be examined rather than self-diagnosed.
Why Skin Changes Become More Important After Age 50
As people age, the skin becomes thinner, loses elasticity, and repairs itself more slowly.
Years of accumulated ultraviolet exposure also increase the risk of certain skin cancers.
The risk of many types of skin cancer rises with age, although younger adults can develop them as well.
Several factors can increase the likelihood of concerning skin conditions, including:
- A history of significant sun exposure or indoor tanning.
- Previous skin cancer or a family history of melanoma.
- A large number of moles or atypical moles.
- A weakened immune system.
- Certain inherited conditions.
- A history of severe sunburns.
Skin cancer can affect people of every skin tone.
Although lighter skin is associated with higher rates of several skin cancers, people with darker skin may experience delayed diagnosis, making awareness important for everyone.
How to Check Your Skin at Home
Regularly becoming familiar with your skin can help you recognize new or changing lesions.
A simple self-examination can be done using a full-length mirror and a handheld mirror.
Check your face, ears, neck, chest, abdomen, arms, hands, legs, and feet.
Don’t forget areas that are easy to overlook, such as the scalp, back, soles of the feet, spaces between the toes, and underneath the nails.
Pay particular attention to any spot that is new, changing, bleeding, painful, or noticeably different from other spots.
Taking dated photographs can help document changes, but photographs should not replace a medical examination.
There is no single self-examination schedule proven appropriate for everyone. People with a history of skin cancer or other major risk factors should follow their dermatologist’s recommendations.
How Doctors Determine Whether a Skin Change Is Serious
A dermatologist will usually begin by examining the affected area and asking when the change first appeared.
They may use a dermatoscope, a handheld instrument that magnifies the skin and reveals structures not easily visible to the naked eye.
If a lesion appears suspicious, a skin biopsy may be recommended.
During a biopsy, a small sample or the entire lesion is removed and examined under a microscope.
This is often the most reliable way to determine whether a suspicious lesion is cancerous.
Blood tests or other investigations may be appropriate when skin changes suggest an underlying medical condition rather than a localized skin problem.
How to Protect Your Skin
Although not every skin condition is preventable, certain habits can reduce your risk of sun-related damage.
The American Academy of Dermatology recommends using broad-spectrum, water-resistant sunscreen with SPF 30 or higher on exposed skin.
Other protective measures include seeking shade, wearing sun-protective clothing, and avoiding tanning beds.
Regular skin awareness is also important.
If you notice an unusual change, avoid attempting to burn, cut, or remove the lesion yourself.
Home treatments can cause injury, infection, and delays in diagnosing potentially serious conditions.
When Should You See a Dermatologist?
Arrange a medical evaluation if you notice a mole that is evolving, a sore that repeatedly bleeds or fails to heal, a persistent scaly lesion, or an unexplained change in skin color or texture.
You should also seek medical advice for sudden widespread skin changes or unexplained bruising.
Seek emergency care for a rapidly spreading non-blanching rash accompanied by fever or severe illness, or for skin symptoms associated with breathing difficulties, confusion, or other signs of a medical emergency.
Most skin changes are not dangerous, but early assessment can make serious conditions easier to treat.
The Bottom Line: Your Skin May Be Giving You an Important Warning
A changing mole, persistent sore, darkened skin fold, unexplained purple spots, or rough scaly patch can have many different causes.
Some are harmless consequences of aging or irritation. Others may indicate skin cancer, metabolic disease, infection, or a blood-related condition.
The most important warning sign is often a change that is new, persistent, worsening, or noticeably different from your usual skin.
You don’t need to panic over every spot or blemish. But you shouldn’t ignore a suspicious change simply because it doesn’t hurt.
Paying attention to your skin and seeking timely medical advice can help detect problems before they become more serious.
Medical disclaimer: This article is for educational purposes only. It cannot diagnose skin conditions and should not replace an examination by a qualified healthcare professional. Images are illustrative and should not be used for self-diagnosis.
Trusted medical references
- American Academy of Dermatology — ABCDEs of Melanoma
- National Cancer Institute — Skin Cancer
- American Academy of Dermatology — Actinic Keratosis
- NHS — Acanthosis Nigricans
- MedlinePlus — Petechiae
