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This information is produced and provided by the National Cancer Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National Cancer Institute via the Internet web site at http://cancer.gov or call 1-800-4-CANCER.
Skin cancer is a disease in which malignant (cancer) cells form in the tissues of the skin.
The skin is the body's largest organ. It protects against heat, sunlight, injury, and infection. Skin also helps control body temperature and stores water, fat, and vitamin D. The skin has several layers, but the two main layers are the epidermis (upper or outer layer) and the dermis (lower or inner layer). Skin cancer begins in the epidermis, which is made up of three kinds of cells:
Anatomy of the skin showing the epidermis (including the squamous cell and basal cell layers), dermis, subcutaneous tissue, and other parts of the skin.
Skin cancer can occur anywhere on the body, but it is most common in skin that is often exposed to sunlight, such as the face, neck, hands, and arms.
There are different types of cancer that start in the skin.
The most common types are basal cell carcinoma and squamous cell carcinoma, which are nonmelanoma skin cancers. Nonmelanoma skin cancers rarely spread to other parts of the body. Melanoma is a much rarer type of skin cancer. It is more likely to invade nearby tissues and spread to other parts of the body. Actinic keratosis is a skin condition that sometimes becomes squamous cell carcinoma.
This summary is about nonmelanoma skin cancer and actinic keratosis. See the following PDQ summaries for information on melanoma and other kinds of cancer that affect the skin:
Skin color and being exposed to sunlight can increase the risk of nonmelanoma skin cancer and actinic keratosis.
Anything that increases your chance of getting a disease is called a risk factor. Having a risk factor does not mean that you will get cancer; not having risk factors doesn't mean that you will not get cancer. Talk with your doctor if you think you may be at risk.
Risk factors for basal cell carcinoma and squamous cell carcinoma include the following:
Risk factors for actinic keratosis include the following:
Although having a fair complexion is a risk factor for skin cancer and actinic keratosis, people of all skin colors can get skin cancer and actinic keratosis.
Nonmelanoma skin cancer and actinic keratosis often appear as a change in the skin.
Not all changes in the skin are a sign of nonmelanoma skin cancer or actinic keratosis. Check with your doctor if you notice any changes in your skin.
Signs of nonmelanoma skin cancer include the following:
Signs of actinic keratosis include the following:
Tests or procedures that examine the skin are used to detect (find) and diagnose nonmelanoma skin cancer and actinic keratosis.
The following procedures may be used:
Certain factors affect prognosis (chance of recovery) and treatment options.
The prognosis (chance of recovery) depends mostly on the stage of the cancer and the type of treatment used to remove the cancer.
Treatment options depend on the following:
After nonmelanoma skin cancer has been diagnosed, tests are done to find out if cancer cells have spread within the skin or to other parts of the body.
The process used to find out if cancer has spread within the skin or to other parts of the body is called staging. The information gathered from the staging process determines the stage of the disease. It is important to know the stage in order to plan treatment.
The following tests and procedures may be used in the staging process:
There are three ways that cancer spreads in the body.
Cancer can spread through tissue, the lymph system, and the blood:
Cancer may spread from where it began to other parts of the body.
When cancer spreads to another part of the body, it is called metastasis. Cancer cells break away from where they began (the primary tumor) and travel through the lymph system or blood.
The metastatic tumor is the same type of cancer as the primary tumor. For example, if skin cancer spreads to the lung, the cancer cells in the lung are actually skin cancer cells. The disease is metastatic skin cancer, not lung cancer.
Staging of nonmelanoma skin cancer depends on whether the tumor has certain "high-risk" features and if the tumor is on the eyelid.
Staging for nonmelanoma skin cancer that is on the eyelid is different from staging for nonmelanoma skin cancer that affects other parts of the body.
Millimeters (mm). A sharp pencil point is about 1 mm, a new crayon point is about 2 mm, and a new pencil eraser is about 5 mm.
The following are high-risk features for nonmelanoma skin cancer that is not on the eyelid:
The following stages are used for nonmelanoma skin cancer that is not on the eyelid:
Stage 0 (Carcinoma in Situ)
Stage 0 nonmelanoma skin carcinoma in situ. Abnormal cells are shown in the epidermis (outer layer of the skin).
In stage 0, abnormal cells are found in the squamous cell or basal cell layer of the epidermis (topmost layer of the skin). These abnormal cells may become cancer and spread into nearby normal tissue. Stage 0 is also called carcinoma in situ.
Tumor sizes. The size of a tumor may be compared to the size of a pea (1 cm), peanut (2 cm), grape (3 cm), walnut (4 cm), lime (5 cm), egg (6 cm), peach (7 cm), or grapefruit (10 cm).
Stage I Stage I nonmelanoma skin cancer. The tumor is no more than 2 centimeters.
In stage I, cancer has formed. The tumor is not larger than 2 centimeters at its widest point and may have one high-risk feature.
Stage II Stage II nonmelanoma skin cancer. The tumor is more than 2 centimeters wide.
In stage II, the tumor is either:
In stage III:
Stage III nonmelanoma skin cancer (1). Cancer has spread from the primary tumor to bones of the jaw, eye socket, or side of the skull.
Stage III nonmelanoma skin cancer (2). Cancer has spread to one lymph node that is 3 centimeters or smaller and is on the same side of the body as the primary tumor. Also, the tumor is 2 centimeters or smaller at its widest point and may have one high-risk feature; OR the tumor is larger than 2 centimeters at its widest point; OR the tumor is any size and has two or more high-risk features. There are five high-risk features: (1) the tumor is thicker than 2 millimeters; (2) the tumor has spread into the lower layer of the skin or into the layer of fat below the skin; (3) the tumor has grown and spread along nerve pathways; (4) the tumor began on an ear or on a lip that has hair on it; and (5) the tumor has cells that look very different from normal cells under a microscope.
In stage IV, one of the following is true:
The following stages are used for nonmelanoma skin cancer on the eyelid:
In stage 0, abnormal cells are found in the epidermis (topmost layer of the skin). These abnormal cells may become cancer and spread into nearby normal tissue. Stage 0 is also called carcinoma in situ.
Stage I is divided into stages IA, IB, and IC.
In stage II, one of the following is true:
Stage III is divided into stages IIIA, IIIB, and IIIC.
The tumor has spread to distant parts of the body.
Treatment is based on the type of nonmelanoma skin cancer or other skin condition diagnosed:
Basal cell carcinoma
Basal cell carcinoma. A skin cancer lesion that looks reddish brown and slightly raised (left panel) and a skin cancer lesion that looks like an open sore with a pearly rim (right panel).
Basal cell carcinoma is the most common type of skin cancer. It usually occurs on areas of the skin that have been in the sun, most often the nose. Often this cancer appears as a raised bump that looks smooth and pearly. Another type looks like a scar and is flat and firm and may be white, yellow, or waxy. Basal cell carcinoma may spread to tissues around the cancer, but it usually does not spread to other parts of the body.
Squamous cell carcinoma
Squamous cell carcinoma. A skin cancer lesion on the face that looks raised and crusty (left panel) and a skin cancer lesion on the leg that looks pink and raised (right panel).
Squamous cell carcinoma occurs on areas of the skin that have been in the sun, such as the ears, lower lip, and the back of the hands. Squamous cell carcinoma may also appear on areas of the skin that have been burned or exposed to chemicals or radiation. Often this cancer appears as a firm red bump. The tumor may feel scaly, bleed, or form a crust. Squamous cell tumors may spread to nearby lymph nodes. Squamous cell carcinoma that has not spread can usually be cured.
Actinic keratosis is a skin condition that is not cancer, but sometimes changes into squamous cell carcinoma. It usually occurs in areas that have been exposed to the sun, such as the face, the back of the hands, and the lower lip. It looks like rough, red, pink, or brown scaly patches on the skin that may be flat or raised, or the lower lip cracks and peels and is not helped by lip balm or petroleum jelly.
There are different types of treatment for patients with nonmelanoma skin cancer and actinic keratosis.
Different types of treatment are available for patients with nonmelanoma skin cancer and actinic keratosis. Some treatments are standard (the currently used treatment), and some are being tested in clinical trials. A treatment clinical trial is a research study meant to help improve current treatments or obtain information on new treatments for patients with cancer. When clinical trials show that a new treatment is better than the standard treatment, the new treatment may become the standard treatment. Patients may want to think about taking part in a clinical trial. Some clinical trials are open only to patients who have not started treatment.
Six types of standard treatment are used:
One or more of the following surgical procedures may be used to treat nonmelanoma skin cancer or actinic keratosis:
Radiation therapy is a cancer treatment that uses high-energy x-rays or other types of radiation to kill cancer cells or keep them from growing. There are two types of radiation therapy:
The way the radiation therapy is given depends on the type of cancer being treated. External radiation therapy is used to treat skin cancer.
Chemotherapy is a cancer treatment that uses drugs to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. When chemotherapy is taken by mouth or injected into a vein or muscle, the drugs enter the bloodstream and can reach cancer cells throughout the body (systemic chemotherapy). When chemotherapy is placed directly into the cerebrospinal fluid, an organ, or a body cavity such as the abdomen, the drugs mainly affect cancer cells in those areas (regional chemotherapy). Chemotherapy for nonmelanoma skin cancer and actinic keratosis is usually topical (applied to the skin in a cream or lotion). The way the chemotherapy is given depends on the condition being treated.
Retinoids (drugs related to vitamin A) are sometimes used to treat squamous cell carcinoma of the skin.
See Drugs Approved for Basal Cell Carcinoma for more information.
Photodynamic therapy (PDT) is a cancer treatment that uses a drug and a certain type of laser light to kill cancer cells. A drug that is not active until it is exposed to light is injected into a vein. The drug collects more in cancer cells than in normal cells. For skin cancer, laser light is shined onto the skin and the drug becomes active and kills the cancer cells. Photodynamic therapy causes little damage to healthy tissue.
Biologic therapy is a treatment that uses the patient's immune system to fight cancer. Substances made by the body or made in a laboratory are used to boost, direct, or restore the body's natural defenses against cancer. This type of cancer treatment is also called biotherapy or immunotherapy.
Interferon and imiquimod are biologic agents used to treat skin cancer. Interferon (by injection) may be used to treat squamous cell carcinoma of the skin. Topical imiquimod therapy (a cream applied to the skin) may be used to treat some small basal cell carcinomas.
Targeted therapy is a type of treatment that uses drugs or other substances to attack cancer cells. Targeted therapies usually cause less harm to normal cells than chemotherapy or radiation therapy do.
Targeted therapy with a signal transduction inhibitor is used to treat basal cell carcinoma. Signal transduction inhibitors block signals that are passed from one molecule to another inside a cell. Blocking these signals may kill cancer cells. Vismodegib and sonidegib are signal transduction inhibitors used to treat basal cell carcinoma.
New types of treatment are being tested in clinical trials.
Information about clinical trials is available from the NCI website.
Treatment for skin cancer may cause side effects.
For information about side effects caused by treatment for cancer, see our Side Effects page.
Patients may want to think about taking part in a clinical trial.
For some patients, taking part in a clinical trial may be the best treatment choice. Clinical trials are part of the cancer research process. Clinical trials are done to find out if new cancer treatments are safe and effective or better than the standard treatment.
Many of today's standard treatments for cancer are based on earlier clinical trials. Patients who take part in a clinical trial may receive the standard treatment or be among the first to receive a new treatment.
Patients who take part in clinical trials also help improve the way cancer will be treated in the future. Even when clinical trials do not lead to effective new treatments, they often answer important questions and help move research forward.
Patients can enter clinical trials before, during, or after starting their cancer treatment.
Some clinical trials only include patients who have not yet received treatment. Other trials test treatments for patients whose cancer has not gotten better. There are also clinical trials that test new ways to stop cancer from recurring (coming back) or reduce the side effects of cancer treatment.
Clinical trials are taking place in many parts of the country. Information about clinical trials supported by NCI can be found on NCI's clinical trials search webpage. Clinical trials supported by other organizations can be found on the ClinicalTrials.gov website.
Follow-up tests may be needed.
Some of the tests that were done to diagnose the cancer or to find out the stage of the cancer may be repeated. Some tests will be repeated in order to see how well the treatment is working. Decisions about whether to continue, change, or stop treatment may be based on the results of these tests.
Some of the tests will continue to be done from time to time after treatment has ended. The results of these tests can show if your condition has changed or if the cancer has recurred (come back). These tests are sometimes called follow-up tests or check-ups.
Basal cell carcinoma and squamous cell carcinoma are likely to recur (come back), usually within 5 years, or new tumors may form. Talk to your doctor about how often you should have your skin checked for signs of cancer.
For information about the treatments listed below, see the Treatment Option Overview section.
Basal Cell Carcinoma
Treatment of basal cell carcinoma may include the following:
Treatment of recurrent basal cell carcinoma is usually Mohs micrographic surgery.
Treatment of basal cell carcinoma that is metastatic or cannot be treated with local therapy may include the following:
Use our clinical trial search to find NCI-supported cancer clinical trials that are accepting patients. You can search for trials based on the type of cancer, the age of the patient, and where the trials are being done. General information about clinical trials is also available.
Squamous Cell Carcinoma
Treatment of squamous cell carcinoma may include the following:
Treatment of recurrent squamous cell carcinoma may include the following:
Treatment of squamous cell carcinoma that is metastatic or cannot be treated with local therapy may include the following:
Actinic keratosis is not cancer but is treated because it may develop into cancer. Treatment of actinic keratosis may include the following:
For more information from the National Cancer Institute about skin cancer, see the following:
For general cancer information and other resources from the National Cancer Institute, see the following:
Physician Data Query (PDQ) is the National Cancer Institute's (NCI's) comprehensive cancer information database. The PDQ database contains summaries of the latest published information on cancer prevention, detection, genetics, treatment, supportive care, and complementary and alternative medicine. Most summaries come in two versions. The health professional versions have detailed information written in technical language. The patient versions are written in easy-to-understand, nontechnical language. Both versions have cancer information that is accurate and up to date and most versions are also available in Spanish.
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Purpose of This Summary
This PDQ cancer information summary has current information about the treatment of skin cancer. It is meant to inform and help patients, families, and caregivers. It does not give formal guidelines or recommendations for making decisions about health care.
Reviewers and Updates
Editorial Boards write the PDQ cancer information summaries and keep them up to date. These Boards are made up of experts in cancer treatment and other specialties related to cancer. The summaries are reviewed regularly and changes are made when there is new information. The date on each summary ("Date Last Modified") is the date of the most recent change.
The information in this patient summary was taken from the health professional version, which is reviewed regularly and updated as needed, by the PDQ Adult Treatment Editorial Board.
Clinical Trial Information
A clinical trial is a study to answer a scientific question, such as whether one treatment is better than another. Trials are based on past studies and what has been learned in the laboratory. Each trial answers certain scientific questions in order to find new and better ways to help cancer patients. During treatment clinical trials, information is collected about the effects of a new treatment and how well it works. If a clinical trial shows that a new treatment is better than one currently being used, the new treatment may become "standard." Patients may want to think about taking part in a clinical trial. Some clinical trials are open only to patients who have not started treatment.
Clinical trials are listed in PDQ and can be found online at NCI's website. Many cancer doctors who take part in clinical trials are also listed in PDQ. For more information, call the Cancer Information Service 1-800-4-CANCER (1-800-422-6237).
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The best way to cite this PDQ summary is:
PDQ® Adult Treatment Editorial Board. PDQ Skin Cancer Treatment. Bethesda, MD: National Cancer Institute. Updated <MM/DD/YYYY>. Available at: https://www.cancer.gov/types/skin/patient/skin-treatment-pdq. Accessed <MM/DD/YYYY>. [PMID: 26389265]
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Last Revised: 2017-08-28
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