What is Skin Cancer? Symptoms, Causes, & Treatment

Skin cancer happens when cells in your skin grow abnormally and out of control. It's actually the most common type of cancer, but here's the reassuring news: most skin cancers are highly treatable when caught early. Think of your skin as having a built-in repair system that sometimes needs a little help getting back on track.

What is skin cancer?

Skin cancer occurs when DNA damage causes skin cells to multiply rapidly and form malignant tumors. Your skin naturally sheds old cells and creates new ones, but sometimes this process goes wrong.

There are three main types, each behaving differently. Basal cell carcinoma grows slowly and rarely spreads to other parts of your body. Squamous cell carcinoma can grow faster but is still very manageable when treated promptly.

Melanoma is the most serious type because it can spread to other organs if not treated early. However, when melanoma is caught in its early stages, the survival rate is excellent at about 99%.

What are the types of skin cancer?

The three main types of skin cancer each have distinct characteristics and behaviors. Understanding these differences can help you know what to watch for.

Basal Cell Carcinoma is the most common type, making up about 80% of all skin cancers. It typically appears as a small, shiny bump or a flat, scaly patch that might bleed easily. This type grows very slowly and almost never spreads to other parts of your body.

Squamous Cell Carcinoma accounts for about 20% of skin cancers. It often looks like a rough, scaly patch, an open sore that won't heal, or a raised growth with a central depression. While it can spread if left untreated, it's still highly curable when caught early.

Melanoma is the least common but most serious type. It can develop from an existing mole or appear as a new dark spot on your skin. The good news is that melanoma is completely curable when detected early, and new treatments are helping even advanced cases.

What are the symptoms of skin cancer?

Skin cancer symptoms can vary depending on the type, but there are key warning signs to watch for. The most important thing to remember is that any change in your skin deserves attention.

For basal and squamous cell carcinomas, you might notice:

• A small, shiny, pearly, or waxy bump
• A flat, firm, scarlike area that's pale or slightly raised
• A sore that bleeds, crusts over, heals, then reopens
• A rough, scaly red or brown patch
• A raised growth with a rough surface and central depression

For melanoma, doctors use the ABCDE rule to help identify concerning moles:

• Asymmetry: One half doesn't match the other half
• Border: Edges are irregular, blurred, or jagged
• Color: Multiple colors or uneven color distribution
• Diameter: Larger than a pencil eraser (6mm)
• Evolving: Any mole that's changing in size, shape, or color

Sometimes melanoma can appear as a new dark streak under a fingernail or toenail, especially in people with darker skin tones. Any persistent sore, bump, or patch that doesn't heal within a few weeks should be checked by a healthcare provider.

What causes skin cancer?

Skin cancer develops when ultraviolet (UV) radiation damages the DNA in your skin cells. This damage can come from various sources, but the sun is the primary culprit.

The main causes include:

• Prolonged sun exposure, especially during peak hours (10 AM to 4 PM)
• Sunburns, particularly blistering sunburns in childhood
• Tanning beds and sun lamps
• Fair skin that burns easily
• Living at high altitudes or in sunny climates
• Exposure to certain chemicals like arsenic
• Radiation therapy treatments
• Chronic skin inflammation or infections

Some rare causes can include inherited genetic conditions like xeroderma pigmentosum, which makes people extremely sensitive to UV light. Certain medications that suppress your immune system can also increase your risk.

It's worth noting that skin cancer can develop even in areas that rarely see sunlight. This happens because UV radiation can penetrate clothing and glass, and some damage accumulates over many years before becoming visible.

When should you see a doctor for skin cancer?

You should see a doctor anytime you notice a new or changing spot on your skin. Early detection makes treatment much more effective and less invasive.

Schedule an appointment if you notice any spot that's growing, bleeding, itching, or changing color. Even if you think it might be nothing, it's always better to have peace of mind.

See a doctor immediately if you have a mole or spot that becomes painful, develops an irregular border, or starts oozing or bleeding. Any sore that doesn't heal within three weeks also needs medical attention.

If you have many moles, a family history of skin cancer, or have had skin cancer before, consider annual skin checks with a dermatologist. These routine visits can catch problems before they become serious.

What are the risk factors for skin cancer?

Several factors can increase your chances of developing skin cancer, but having risk factors doesn't mean you'll definitely get cancer. Understanding these factors helps you take better care of your skin.

The most common risk factors include:

• Fair skin, light hair, and light-colored eyes
• A history of sunburns or excessive sun exposure
• Many moles or unusual moles
• Family history of skin cancer
• Personal history of skin cancer
• Weakened immune system
• Age over 50
• Male gender (men develop skin cancer slightly more often)

Some rarer risk factors include exposure to radiation, certain chemicals, or having had organ transplant surgery. People with certain genetic conditions like albinism or xeroderma pigmentosum have much higher risks.

Having darker skin provides some natural protection against UV radiation, but skin cancer can still occur. In people with darker skin, melanoma often appears in areas with less pigmentation, like palms, soles of feet, or under fingernails.

What are the possible complications of skin cancer?

Most skin cancers cause few complications when treated early, but it's helpful to understand what could happen if cancer goes untreated. This knowledge isn't meant to scare you, but to emphasize why prompt treatment matters.

For basal cell carcinoma, the main complication is local tissue damage. If left untreated for years, it can grow deep into skin, muscle, and even bone, causing disfigurement in the affected area.

Squamous cell carcinoma can spread to nearby lymph nodes and, rarely, to other organs. This typically only happens if the cancer is ignored for a long time or occurs in high-risk areas like lips, ears, or genitals.

Melanoma complications can be more serious because this cancer can spread to other parts of your body, including vital organs like the liver, lungs, or brain. However, this progression usually takes time, which is why early detection is so effective.

In very rare cases, extensive sun damage can lead to multiple skin cancers developing over time. Some people also experience scarring or changes in skin color after treatment, though modern techniques minimize these effects.

How can skin cancer be prevented?

The great news is that skin cancer is largely preventable with some simple daily habits. Most prevention strategies focus on protecting your skin from UV radiation.

Your daily sun protection routine should include:

• Applying broad-spectrum sunscreen with SPF 30 or higher every day
• Reapplying sunscreen every two hours and after swimming or sweating
• Seeking shade during peak sun hours (10 AM to 4 PM)
• Wearing protective clothing, wide-brimmed hats, and UV-blocking sunglasses
• Avoiding tanning beds completely

Monthly self-examinations help you become familiar with your skin and notice any changes early. Use a mirror to check areas you can't easily see, or ask a family member to help.

Professional skin checks are especially important if you have risk factors. Your doctor can spot subtle changes that might not be obvious to you and provide personalized prevention advice.

How is skin cancer diagnosed?

Diagnosing skin cancer usually starts with a visual examination by your doctor or dermatologist. They'll look at the suspicious area and may use a special magnifying device called a dermatoscope.

If the spot looks concerning, your doctor will perform a biopsy. This involves removing a small piece of the suspicious tissue, which is then examined under a microscope by a specialist called a pathologist.

There are several types of biopsies, depending on the size and location of the spot. A shave biopsy removes the top layers, while a punch biopsy takes a deeper, round sample. An excisional biopsy removes the entire suspicious area.

The biopsy results usually come back within a week or two. If cancer is found, additional tests might be needed to determine if it has spread, especially for melanoma cases.

What is the treatment for skin cancer?

Treatment for skin cancer depends on the type, size, location, and stage of the cancer. The good news is that most skin cancers can be completely cured with relatively simple procedures.

For basal and squamous cell carcinomas, common treatments include:

• Surgical excision: Cutting out the tumor with a border of healthy tissue
• Mohs surgery: Removing cancer layer by layer while checking margins
• Cryotherapy: Freezing the cancer cells with liquid nitrogen
• Electrodesiccation and curettage: Scraping and burning the tumor
• Topical medications for very early or superficial cancers

Melanoma treatment often involves surgical removal with wider margins. If the melanoma has spread, treatments might include immunotherapy, targeted therapy, chemotherapy, or radiation therapy.

Many skin cancer treatments can be done in your doctor's office with local anesthesia. Recovery is usually quick, with most people returning to normal activities within a few days to weeks.

How to care for yourself during skin cancer treatment?

Taking care of yourself during treatment helps your body heal and can make the process more comfortable. Most skin cancer treatments are outpatient procedures with minimal downtime.

After surgery, keep the wound clean and dry as instructed by your doctor. You'll likely have specific instructions about changing bandages and when you can shower or bathe.

Protect the treated area from sun exposure during healing, as new skin is particularly sensitive. Use gentle, fragrance-free moisturizers to keep the area comfortable as it heals.

Watch for signs of infection like increased redness, warmth, swelling, or pus. Contact your doctor if you notice any concerning changes or if pain increases significantly after the first few days.

Eat a healthy diet rich in fruits and vegetables to support your immune system and healing. Stay hydrated and get plenty of rest to help your body recover effectively.

How should you prepare for your doctor appointment?

Preparing for your appointment helps ensure you get the most out of your visit and provides your doctor with helpful information. A little preparation can ease any anxiety you might feel.

Before your visit, write down when you first noticed the spot and any changes you've observed. Take photos if the spot is in a hard-to-see location, as this can help your doctor track changes over time.

Make a list of all medications, supplements, and vitamins you take. Also note any family history of skin cancer or other cancers, as this information helps guide your care.

Prepare questions you want to ask, such as what treatment options are available, what to expect during recovery, and how often you'll need follow-up visits. Don't hesitate to ask about anything that concerns you.

Arrive without makeup, nail polish, or jewelry that might interfere with the examination. Wear comfortable clothing that allows easy access to the area of concern.

What's the key takeaway about skin cancer?

Skin cancer is common, but it's also highly treatable when caught early. The most important thing you can do is pay attention to your skin and see a doctor promptly if you notice any changes.

Daily sun protection is your best defense against developing skin cancer in the first place. Simple habits like wearing sunscreen and protective clothing can significantly reduce your risk.

Remember that having a suspicious spot doesn't necessarily mean you have cancer. Many skin changes are benign, but only a healthcare professional can make that determination safely.

If you are diagnosed with skin cancer, know that treatments are very effective, especially when the cancer is caught early. Most people go on to live completely normal, healthy lives after treatment.