Skin Cancer
What is Skin Cancer?
Skin cancer happens when skin cells grow abnormally and out of control. It is the most common type of cancer in the United States. More than 5 million cases are diagnosed each year.
There are three main types of skin cancer. Basal cell carcinoma starts in the bottom layer of skin and grows slowly. Squamous cell carcinoma begins in the upper skin layers and can spread if untreated. Melanoma develops from pigment-producing cells and is the most dangerous type because it spreads quickly.
Most skin cancers develop on areas exposed to the sun, like the face, neck, arms, and hands. Ultraviolet radiation from the sun or tanning beds damages the DNA in skin cells. When this damage builds up over time, cells can become cancerous. Catching skin cancer early makes treatment much more effective.
Symptoms
- A new growth or mole that changes in size, shape, or color
- A sore that does not heal within a few weeks
- A spot that itches, bleeds, or becomes crusty
- A mole with irregular borders or multiple colors
- A pearly or waxy bump on the skin
- A flat, flesh-colored or brown scar-like lesion
- A firm red nodule that may bleed
- A dark streak under a fingernail or toenail
Many people with early skin cancer have no symptoms or pain. This is why regular skin checks are important. Some skin cancers look harmless at first but grow or change over months.
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Causes and risk factors
The main cause of skin cancer is too much exposure to ultraviolet radiation from the sun or tanning beds. UV rays damage the genetic material in skin cells. Over many years, this damage can trigger cancer. People with fair skin, light eyes, and blonde or red hair have higher risk. A history of severe sunburns, especially in childhood, increases risk significantly.
Other risk factors include having many moles or unusual moles, a family history of skin cancer, and a weakened immune system. People who work outdoors or live in sunny climates face greater exposure. Smoking may increase risk for certain types of skin cancer. Age also matters because UV damage accumulates over a lifetime. Emerging research shows that certain nutrients like nicotinamide may help protect skin cells from damage.
How it's diagnosed
Doctors diagnose skin cancer through visual examination and biopsy. A dermatologist will look at suspicious spots using a special magnifying tool called a dermatoscope. If a growth looks concerning, they will remove a small sample of tissue. A lab analyzes this sample under a microscope to check for cancer cells.
Blood tests are not typically used to diagnose skin cancer directly. However, some biomarkers like nicotinamide levels may provide information about nutritional factors that support skin health. If you notice changes in your skin or have risk factors, talk to a doctor about a full skin examination. Early detection through regular skin checks saves lives.
Treatment options
- Surgical removal of the cancerous growth, the most common treatment
- Mohs surgery for larger or aggressive cancers, removing layers until margins are clear
- Cryotherapy using liquid nitrogen to freeze and destroy precancerous spots
- Radiation therapy for cancers that cannot be easily removed with surgery
- Topical medications like creams containing fluorouracil or imiquimod for superficial cancers
- Immunotherapy drugs that help your immune system attack melanoma cells
- Targeted therapy medications for advanced melanoma with specific gene mutations
- Sun protection including daily sunscreen with SPF 30 or higher and protective clothing
- Nicotinamide supplements, which studies show may reduce risk of new skin cancers
- Regular skin exams every 3 to 12 months after treatment to check for recurrence
Frequently asked questions
Skin cancer can look like a new mole, a changing mole, or a sore that will not heal. Basal cell carcinoma often appears as a pearly bump or pink patch. Squamous cell carcinoma may look like a scaly red patch or firm nodule. Melanoma typically shows up as a mole with irregular borders, multiple colors, or asymmetric shape.
Blood tests cannot directly diagnose skin cancer. A skin biopsy is needed to confirm cancer. However, blood tests can measure certain biomarkers like nicotinamide levels that relate to skin health. Research shows nicotinamide may help protect against skin cancer development. A doctor will use visual examination and biopsy as primary diagnostic tools.
Growth rates vary by type. Basal cell carcinoma grows very slowly over months or years. Squamous cell carcinoma grows faster but still takes weeks to months to become dangerous. Melanoma can grow and spread quickly, sometimes in just weeks. Any changing spot should be examined promptly regardless of growth speed.
Many skin cancers are preventable through sun protection. Wear sunscreen with SPF 30 or higher every day, even when cloudy. Avoid tanning beds completely. Wear protective clothing and seek shade during peak sun hours from 10 AM to 4 PM. Some studies show taking nicotinamide supplements may reduce risk in people with a history of skin cancer.
Melanoma is the most dangerous type of skin cancer. It can spread to other organs quickly if not caught early. Melanoma causes the majority of skin cancer deaths. However, when detected early, melanoma is highly treatable with a 5-year survival rate above 99 percent for localized cases.
People with fair skin, light hair, and blue or green eyes have the highest risk. Those with many moles, a history of severe sunburns, or family history of skin cancer face increased risk. People who spend lots of time in the sun, use tanning beds, or have weakened immune systems are also at higher risk. Anyone can get skin cancer regardless of skin tone.
Examine your entire body once a month looking for new or changing spots. Use a mirror to check hard-to-see areas or ask a partner for help. See a dermatologist yearly for a professional skin exam if you have risk factors. People with a history of skin cancer may need checks every 3 to 6 months.
Yes, skin cancer can recur even after successful treatment. About 50 percent of people who have one skin cancer will develop another within 5 years. This is why follow-up care is critical. Regular skin exams, sun protection, and sometimes preventive treatments like nicotinamide supplements help reduce recurrence risk.
Nicotinamide is a form of vitamin B3 that helps repair DNA damage in skin cells. Studies show taking 500 mg twice daily reduces the rate of new basal cell and squamous cell carcinomas by about 23 percent in high-risk people. It also reduces precancerous spots called actinic keratoses. Talk to your doctor about whether nicotinamide supplementation is right for you.
Schedule an appointment with a dermatologist as soon as possible. Do not wait to see if the spot changes or grows. Take a photo to track any changes before your appointment. Write down when you first noticed it and any symptoms like itching or bleeding. Early detection dramatically improves treatment outcomes for all skin cancer types.