What is Squamous Cell Carcinoma (SCC)?
Squamous cell carcinoma of the skin is a common form of skin cancer that develops in the squamous cells that make up the middle and outer layers of the skin.
Squamous cell carcinoma of the skin is usually not life-threatening, though it can be aggressive. Untreated, squamous cell carcinoma of the skin can grow large or spread to other parts of your body, causing serious complications.
Most squamous cell carcinomas of the skin result from prolonged exposure to ultraviolet (UV) radiation, either from sunlight or from tanning beds or lamps. Avoiding UV light helps reduce your risk of squamous cell carcinoma of the skin and other forms of skin cancer.
Squamous cells are found in many places in your body, and squamous cell carcinoma can occur anywhere squamous cells are found. Squamous cell carcinoma of the skin refers to cancer that forms in the squamous cells found in the skin.
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Before Squamous Cell Carcinoma Treatment
Squamous cell carcinoma of the skin most often occurs on sun-exposed skin, such as your scalp, the backs of your hands, your ears or your lips. But it can occur anywhere on your body, including inside your mouth, the bottoms of your feet and on your genitals.
Signs and symptoms of squamous cell carcinoma of the skin include:
. A firm, red nodule
. A flat sore with a scaly crust
. A new sore or raised area on an old scar or ulcer
. A rough, scaly patch on your lip that may evolve to an open sore
. A red sore or rough patch inside your mouth
. A red, raised patch or wart-like sore on or in the anus or on your genitals
When to see a doctor
Make an appointment with your doctor if you have a sore or scab that doesn't heal in about two months or a flat patch of scaly skin that won't go away.
Squamous cell carcinoma of the skin occurs when the flat, thin squamous cells in the middle and outer layers of your skin develop changes (mutations) in their DNA. A cell's DNA contains the instructions that tell a cell what to do. The mutations tell the squamous cells to grow out of control and to continue living when normal cells would die.
Most of the DNA mutations in skin cells are caused by ultraviolet (UV) radiation found in sunlight and in commercial tanning lamps and tanning beds.
But sun exposure doesn't explain skin cancers that develop on skin not ordinarily exposed to sunlight. This indicates that other factors may contribute to your risk of skin cancer, such as having a condition that weakens your immune system.
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Factors that may increase your risk of squamous cell carcinoma of the skin include:
. Fair skin. Anyone, regardless of skin color, can get squamous cell carcinoma of the skin. However, having less pigment (melanin) in your skin provides less protection from damaging UV radiation.
If you have blond or red hair and light-colored eyes and you freckle or sunburn easily, you're much more likely to develop skin cancer, including squamous cell carcinoma, than is a person with darker skin.
. Excessive sun exposure. Being exposed to UV light from the sun increases your risk of squamous cell carcinoma of the skin. Spending lots of time in the sun — particularly if you don't cover your skin with clothing or sunblock — increases your risk of squamous cell carcinoma of the skin even more.
. Use of tanning beds. People who use indoor tanning beds have an increased risk of squamous cell carcinoma of the skin.
. A history of sunburns. Having had one or more blistering sunburns as a child or teenager increases your risk of developing squamous cell carcinoma of the skin as an adult. Sunburns in adulthood also are a risk factor.
. A personal history of precancerous skin lesions. Having a precancerous skin lesion, such as actinic keratosis or Bowen's disease, increases your risk of squamous cell carcinoma of the skin.
. A personal history of skin cancer. If you've had squamous cell carcinoma of the skin once, you're much more likely to develop it again.
. Weakened immune system. People with weakened immune systems have an increased risk of skin cancer. This includes people who have leukemia or lymphoma and those who take medications that suppress the immune system, such as those who have undergone organ transplants.
. Rare genetic disorder. People with xeroderma pigmentosum, which causes an extreme sensitivity to sunlight, have a greatly increased risk of developing skin cancer.
Untreated squamous cell carcinoma of the skin can destroy nearby healthy tissue, spread to the lymph nodes or other organs, and may be fatal, although this is uncommon.
The risk of aggressive squamous cell carcinoma of the skin may be increased in cases where the cancer:
. Is particularly large or deep
. Involves the mucous membranes, such as the lips
. Occurs in a person with a weakened immune system, such as someone who takes anti-rejection medications after an organ transplant or someone who has chronic leukemia.
Most squamous cell carcinomas of the skin can be prevented. To protect yourself:
. Avoid the sun during the middle of the day. For many people in North America, the sun's rays are strongest between about 10 a.m. and 3 p.m. Schedule outdoor activities for other times of the day, even during winter or when the sky is cloudy.
. Wear sunscreen year-round. Use a broad-spectrum sunscreen with an SPF of at least 30, even on cloudy days. Apply sunscreen generously, and reapply every two hours — or more often if you're swimming or perspiring.
. Wear protective clothing. Cover your skin with dark, tightly woven clothing that covers your arms and legs, and a broad-brimmed hat, which provides more protection than does a baseball cap or visor.
Some companies also sell protective clothing. A dermatologist can recommend an appropriate brand. Don't forget sunglasses. Look for those that block both types of UV radiation — UVA and UVB rays.
. Avoid tanning beds. Tanning beds emit UV rays and can increase your risk of skin cancer.
. Check your skin regularly and report changes to your doctor. Examine your skin often for new skin growths or changes in existing moles, freckles, bumps and birthmarks. With the help of mirrors, check your face, neck, ears and scalp.
Examine your chest and trunk and the tops and undersides of your arms and hands. Examine both the front and back of your legs and your feet, including the soles and the spaces between your toes. Also check your genital area and between your buttocks.
Tests and procedures used to diagnose squamous cell carcinoma of the skin include:
. Physical exam. Your doctor will ask questions about your health history and examine your skin to look for signs of squamous cell carcinoma of the skin.
. Removing a sample of tissue for testing. To confirm a squamous cell carcinoma of the skin diagnosis, your doctor will use a tool to cut away some or all of the suspicious skin lesion (biopsy). What type of skin biopsy you undergo depends on your particular situation. The tissue is sent to a laboratory for examination.
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During Squamous Cell Carcinoma Treatment
Most squamous cell carcinomas of the skin can be completely removed with relatively minor surgery or occasionally with a medicine applied to the skin. Which treatments are best for you depends on the size, location and aggressiveness of the tumor, as well as your own preferences.
Treatments for very small skin cancers
If your skin cancer is very small and has a low risk of spreading, you might consider less invasive treatments, including:
. Curettage and electrodessication (C and E). C and E treatment involves removing the surface of the skin cancer with a scraping instrument (curet) and then searing the base of the cancer with an electric needle. This treatment is often used for small or very superficial squamous cell cancers of the skin.
. Laser therapy. An intense beam of light vaporizes growths, usually with little damage to surrounding tissue and with a reduced risk of bleeding, swelling and scarring. Laser treatment may be an option for very superficial skin lesions.
. Freezing. This treatment involves freezing cancer cells with liquid nitrogen (cryosurgery). It may be an option for treating superficial skin lesions. Freezing might be done after using a scraping instrument (curet) to remove the surface of the skin cancer.
. Photodynamic therapy. Photodynamic therapy combines photosensitizing drugs and light to treat superficial skin cancers. During photodynamic therapy, a liquid drug that makes the cancer cells sensitive to light is applied to the skin. Later, a light that destroys the skin cancer cells is shined on the area.
Treatments for larger skin cancers
More invasive treatments might be recommended for larger squamous cell carcinomas and those that extend deeper into the skin. Options might include:
. Simple excision. In this procedure, your doctor cuts out the cancerous tissue and a surrounding margin of healthy skin. Your doctor may recommend removing additional normal skin around the tumor in some cases (wide excision). To minimize scarring, especially on your face, consult a doctor skilled in skin reconstruction.
. Mohs surgery. During Mohs surgery, your doctor removes the cancer layer by layer, examining each layer under the microscope until no abnormal cells remain. This allows the surgeon to be certain the entire growth is removed and avoid taking an excessive amount of surrounding healthy skin.
. Radiation therapy. Radiation therapy uses high-energy beams, such as X-rays and protons, to kill cancer cells. Radiation therapy is sometimes used after surgery when there is an increased risk that the cancer will return. It might also be an option for people who can't undergo surgery.
Treatments for skin cancer that spreads beyond the skin
When squamous cell carcinoma spreads to other parts of the body, drug treatments might be recommended, including:
. Chemotherapy. Chemotherapy uses powerful drugs to kill cancer cells. If squamous cell carcinoma spreads to the lymph nodes or other parts of the body, chemotherapy can be used alone or in combination with other treatments, such as targeted drug therapy and radiation therapy.
. Targeted drug therapy. Targeted drug treatments focus on specific weaknesses present within cancer cells. By blocking these weaknesses, targeted drug treatments can cause cancer cells to die. Targeted drug therapy is usually combined with chemotherapy.
. Immunotherapy. Immunotherapy is a drug treatment that helps your immune system to fight cancer. Your body's disease-fighting immune system might not attack cancer because the cancer cells produce proteins that blind the immune system cells. Immunotherapy works by interfering with that process. For squamous cell carcinoma of the skin, immunotherapy might be considered when the cancer is advanced and other treatments aren't an option.
After Squamous Cell Carcinoma Treatment
What is the prognosis/outlook for patients who have squamous cell carcinoma (SCC)?
When SCC is found and treated early, the outlook is very good. However, it is important to find these early because larger tumors can cause more damage and can spread.
When should I call the doctor about squamous cell carcinoma (SCC)?
If you have never had skin cancer or if you have had SCC, contact your doctor if:
. You have any skin changes that cause you worry, including a new lump, mole, or sore that does not heal, or changes in a mole or spot you have had for some time.
. You need to schedule your yearly skin check appointment.
. You have any issues related to your treatment for SCC that worry you, such as excessive pain, bleeding or itching.