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Skin cancer is the most common type of cancer, probably making up more than half of all diagnosed cases of cancer, according to the American Cancer Society (ACS). The incidence of skin cancer is rising dramatically in the United States. About 3.3 million cases of non-melanoma are diagnosed each year, leading to about 3,000 deaths. And the ACS estimates that in 2016, there will be 76,380 new cases of melanoma and 10,130 deaths from the disease. In fact, between 40 percent and 50 percent of people in the United States over age 65 will develop non-melanoma skin cancer. This type of cancer is highly treatable when diagnosed in its early stages and is usually relatively easy to diagnose.
The majority of lifetime sun exposure occurs before age 20, and skin cancer can take 20 years or more to develop. In fact, very young children who experience as few as two to three severe sunburns are believed to have an increased risk of developing skin cancer later in life. That's not to say you should ignore your risk of developing skin cancer. You need to be concerned about skin cancer, whether your sunbathing days are over or you still spend time pursuing the perfect tan.
The Structure of Skin
The skin is the largest organ in your body and is the body's first defense against disease and infection. It also protects your internal organs from injuries. The skin regulates body temperature, prevents excess fluid loss and helps to remove excess water and salt from your body.
Skin is composed of two layers: the epidermis (the outermost layer of skin) and the dermis (the lower layer). The epidermis itself has four layers: the stratum corneum, the granular layer, the squamous cell layer and the basal cell layer. Keratin (dead, dense protein cells) makes up the stratum corneum or outer layer of the epidermis—the skin layer that can be seen and felt.
The granular layer moves the dead keratin cells to the surface of the epidermis. The squamous cell layer produces keratin for the stratum corneum and also transports water. The basal cell layer is the lowest layer of the epidermis. This is where squamous cells are produced and where the cells that produce melanin, or skin pigment, reside.
The dermis is the deeper layer of skin. It is a diverse combination of blood vessels, hair follicles and sebaceous glands or oil glands. The proteins collagen and elastin are found in the dermis. They provide support and elasticity to the skin. The sun's rays eventually break down these proteins. With age, the skin naturally begins to wrinkle and sag.
The subcutaneous level, or subcutis, is a layer of fatty tissue that provides nourishment to the dermis and upper layers of skin. It also conserves body heat and cushions internal organs against trauma. Blood vessels, nerves, sweat glands and deeper hair follicles are found here.
Types of Skin Cancer
There are two main groups of skin cancer: non-melanoma skin cancer, the most common type of skin cancer, and melanoma (sometimes referred to as "malignant melanoma") skin cancer.
According to the ACS, basal cell carcinoma makes up 80 percent of non-melanoma skin cancers, and squamous cell carcinomas account for about 20 percent. About 5.4 million cases of non-melanoma skin cancer are diagnosed every year in the United States. Men have a higher risk than women of developing these skin cancers.
Melanoma is the least common, but most aggressive, of the three types of skin cancer. It originates in the skin's melanocytes—the cells that produce pigment, or melanin.
In 2016, the ACS estimates that 76,380 new cases of melanoma will be diagnosed in the United States—about 1 percent of all diagnosed skin cancers. But melanoma accounts for the vast majority of skin cancer deaths. One person dies of melanoma almost every hour (every 52 minutes).
Risk Factors
Anyone can develop skin cancer, but people with fair complexions are more susceptible to precancerous conditions and skin cancer than people with darker skin tones. That's because darker skin has more melanin, which provides some natural protection against the sun's damaging rays. In addition to fair skin, other risk factors for skin cancer include:
Health care professionals are able to evaluate many skin abnormalities. A primary care physician should be the first health care professional you see if you notice something suspicious on your skin. Then you might consult with a dermatologist, a physician with extensive training in skin care and skin disorders, particularly skin cancer.
The first step in detecting abnormalities that may be skin cancer begins with you. Examine your skin once a month for any suspicious changes. Look for changes in color, size and surface texture of a mole. Sores that won't heal may also indicate cancerous or precancerous conditions of the skin that need attention.
Actinic keratoses. This precancerous condition typically occurs in people with a long history of sun-damaged skin. Lesions appear as rough, crusty bumps on the back of the hands, lips, face, scalp or neck that may itch or feel tender on sun-exposed skin. They may be pink or white. If untreated, these bumps may develop into skin cancer. They affect an estimated 58 million Americans and are usually more prevalent in people over 40 and in sunnier climates. However, they may show up earlier in people who have used tanning beds or sun lamps.
Basal cell carcinoma. Basal cell carcinoma show up as flat, firm, pale areas or as small raised pink or red pearly bumps that may bleed after minor injury. These bumps or growths may appear anywhere on the body regularly exposed to the sun, such as the head and neck. They are slow growing and rarely spread to other parts of the body. But they can extend deep into the skin, causing significant local damage. Approximately 80 percent of all basal and squamous cell skin cancer cases diagnosed annually are basal cell carcinoma. This form of skin cancer has a high cure rate. However, if left untreated, basal cell carcinoma can result in disfigurement.
Squamous cell carcinoma. The second most common non-melanoma skin cancer, squamous cell carcinoma, appears as nodules or as red, scaly patches, typically on the ears, the face, the lips and mouth. These patches eventually develop into large masses. According to the Skin Cancer Foundation, more than one million cases of this type of cancer are diagnosed each year, leading to about 8,800 deaths. This type of skin cancer is slightly more likely than basal cell carcinoma to spread to other parts of the body. But it is also highly treatable.
Melanoma: Melanoma can develop from a preexisting mole or on clear, smooth skin. Unlike a noncancerous mole, melanoma is irregularly shaped or has irregular borders, and is black, brown or tan. It can also look like a pink or white bump and be called "amelanotic." Melanoma is rare in childhood and adolescence, but it is one of the more common cancers in younger adulthood and middle age. It is especially prevalent in late middle and older age. The leg is the most common site in women, and the trunk is the most common site in men. Early diagnosis is key to improving the prognosis in this potentially fatal disease.
It is important to remember the "ABCs" of melanoma. The AAD has developed an easy-to-use method to evaluate your skin for melanoma. Look for:
Excessive sun exposure causes the majority of melanoma. A family history of the disease is also a major risk factor. Individuals with a family history of melanoma, or who have had melanoma in the past, may need to see a dermatologist regularly in addition to performing self-examinations. Talk to your dermatologist about how often you should be professionally screened. To learn how to effectively perform a self-examination, visit The Skin Cancer Foundation https://www.skincancer.org/early-detection/self-exams/
Other types of skin cancer: Less common types of skin cancer, which together make up only 1 percent of all cancers, include:
Diagnostic Tests
To determine if your skin abnormalities are skin cancer, your dermatologist may perform a biopsy: taking a sample of skin to examine under a microscope. After receiving a local anesthetic, you may feel some minor discomfort—a small needle stick, burning and pressure. There are four primary types of biopsies:
To determine how widespread a melanoma is, your health care professional uses a system to describe its size and pervasiveness. The most common system is called the "TNM" system in which:
Using this system, melanomas are grouped according to stage. The stages are:
There are several treatments your dermatologist may prescribe for actinic keratoses (precancerous lesions) or skin cancer:
For precancerous lesions:
For non-melanoma skin cancers:
For melanomas:
About 90 percent of all skin cancers could be prevented by protecting yourself from the harmful rays of the sun.
Sunlight consists of two types of ultraviolet (UV) rays that damage skin—UVA and UVB rays. UVC rays, another spectrum in sunlight, are also potentially harmful, but the ozone layer blocks most of them from reaching the earth. UVA and UVB rays are present all year and are hazardous, whether they are direct or reflected. When the sun's ultraviolet radiation reaches the surface of the skin, the skin reacts by producing melanin—otherwise known as a tan—to protect itself.
UVB rays are the main cause of sunburn and skin cancer. This type of sunlight intensifies during the summer and damages skin more quickly than UVA rays. The epidermis absorbs most of the intensity of UVB rays. The rays are strongest between 10 a.m. and 4 p.m., which is when the skin is most likely to burn.
UVA rays have a longer wavelength and penetrate deeper through the skin's layers. UVA rays also penetrate through glass and are present on cloudy days and all year round, even early and late in the day. UVA rays contribute to wrinkling of the skin and immunosuppression, as well as the development of skin cancer. They are also responsible for tanning.
UVA rays also are used in tanning booths. There, they not only inflict the same type of skin and eye damage as the sun, they may be as much as 12 times stronger than natural sunlight, depending on the bed.
To screen for skin cancer, ask your health care professional to examine your skin carefully as part of a routine cancer-related checkup. You should also examine your own skin for abnormalities, preferably once a month. If you find anything suspicious, make an appointment with your health care professional.
Minimize Total Sun Exposure
For the best protection from the sun's harmful rays:
Don't forsake the sun altogether. Instead, follow these steps to greatly reduce your risk of developing skin cancer.
Sunscreens
Nothing is as effective at reducing your risk of skin cancer as avoiding the sun or using physical "screens" such as umbrellas, broad-brimmed hats and long-sleeved shirts. However, sunscreens should also be an important part of your daily skin health routine because they absorb ultraviolet (UV) rays.
The American Academy of Dermatology (AAD) recommends you look for the following in a sunscreen:
The FDA is continuing to study spray products to establish levels of effectiveness and to see if there's any danger from accidental inhalation. Until that information is available, if you (or your kids) prefer the spray sunscreens, be sure to use a lotion on and near your face and apply the spray generously to the other parts of your body.
To help ensure the safety of sunscreens, Congress passed the Sunscreen Innovation Act (SIA) in 2014. The SIA created a new process for the review of safety and effectiveness of nonprescription sunscreen active ingredients.
Remember, any sunscreen not labeled as "broad spectrum" or that has an SPF value between 2 and 14 may only help protect against sunburn (and even there, your protection is minimal). These products must carry a "Skin Cancer/Skin Aging Alert" to remind you that you are not protected against skin cancer or early skin aging.
If you develop a rash or other type of allergic response to a sunscreen, try a different brand or form (lotion vs. oil, for example) to see if you can better tolerate it. Sunscreens containing higher levels of SPF tend to stay on the skin longer. Gels wash off more easily and need to be reapplied more frequently, but may be preferable if you are acne-prone or have sensitive skin.
Lotions, oils, gels and creams can all be effective sunscreens, but all sunscreens should be reapplied after water contact and sweating.
Review the following Questions to Ask about skin cancer so you're prepared to discuss this important health issue with your health care professional.
No. Tanning beds use UVA rays. They may not only inflict the same type of skin and eye damage as the sun, but may also be as much as 12 times stronger than natural sunlight. Although UVA rays are milder than UVB rays—the main cause of sunburn and sun cancer—UVA wavelengths are longer and they penetrate deeper through the skin's layers. UVA rays contribute to wrinkling the skin, as well as to the development of skin cancer.
Yes. Although sun exposure is responsible for most cases of melanoma, a family history of the disease can also be a risk factor. You are especially at risk if other members of your immediate family have had melanoma. People with atypical moles (nevi) are also at higher risk for developing melanoma. Individuals with a family history of melanoma, or who have had melanoma in the past, may need to see a dermatologist regularly in addition to performing self-examinations. Talk to your dermatologist about how often you should be professionally screened.
No. Anyone can develop skin cancer, although people with fair complexions tend to be more susceptible to skin cancer and precancerous conditions than people with darker skin tones. In addition to fair skin and light hair, risk factors for skin cancer include: a tendency to freckle or burn easily; lots of sun exposure throughout your life; sunburns as a child or adolescent; family history of the disease; history of radiation therapy; chronic scarring from diseases or burns; and exposure to toxic materials such as arsenic.
Many groups, including the American Academy of Dermatology, recommend using broad-spectrum products with a sun protection factor (SPF) of 30 or higher.
No. Sunlight is our primary source of vitamin D, important for building strong bone and other health-related issues. Sunlight isn't entirely bad, but tanning (and long-term exposure) is. Learn how to protect your skin whenever you're outside.
While sunscreen helps minimize damaging sunburns, it doesn't completely prevent burning. The best prevention is still to minimize the total amount of sun exposure your skin receives. This includes avoiding the sun between 10 a.m. and 4 p.m., when its rays are strongest; wearing a large-brimmed hat and sunglasses to protect your scalp and eyes; covering other sun-exposed parts of your body; staying in the shade when possible; and limiting the time you spend in the sun.
If you're prone to rashes, try different brands and types of sunscreen until you find one that doesn't cause a rash. Gels wash off more easily and need to be reapplied more frequently than sunscreen lotions or creams, but they may be preferable if you are acne-prone. Discuss you skin reactions with your health care professional, perhaps a dermatologist, for other suggestions.
It's important to remember that your average lifetime sun exposure risk occurs before age 20, and that skin cancer can take 20 years or more to develop. In fact, very young children who experience as few as two to three severe sunburns are believed to have an increased risk of developing skin cancer later in life. So examine your skin once a month for anything unusual.
Although melanoma typically begins in or around an existing mole, it can also appear without warning on clear skin. You should bring your condition to the attention of your dermatologist for further evaluation and an accurate diagnosis.
For information and support on coping with Skin Cancer, please see the recommended organizations, books and Spanish-language resources listed below.
American Academy of Dermatology
Website: https://www.aad.org
Address: P.O. Box 4014
Schaumburg, IL 60618
Hotline: 1-866-503-SKIN (7546)
Phone: 847-240-1280
Email: mrc@aad.org
American Cancer Society (ACS)
Website: https://www.cancer.org
Address: 250 Williams Street
Atlanta, GA 30303
Hotline: 1-800-ACS-2345 (1-800-227-2345)
Phone: 404-315-1123
American Institute for Cancer Research
Website: https://www.aicr.org
Address: 1759 R Street, NW
Washington, DC 20009
Hotline: 1-800-843-8114
Phone: 202-328-7744
Email: aicrweb@aicr.org
American Society for Dermatologic Surgery
Website: https://www.asds.net
Address: 5550 Meadowbrook Dr., Suite 120
Rolling Meadows, IL 60008
Phone: 847-956-0900
Cancer Care, Inc.
Website: https://www.cancercare.org
Address: 275 Seventh Ave., Floor 22
New York, NY 10001
Hotline: 1-800-813-HOPE (1-800-813-4673)
Phone: 212-712-8400
Email: info@cancercare.org
Cancer Information and Counseling Line (CICL)
Address: AMC Cancer Research Center
1600 Pierce Street
Denver, CO 80214
Hotline: 1-800-525-3777
Email: contactus@amc.org
Corporate Angel Network
Website: https://www.corpangelnetwork.org
Address: Westchester County Airport
One Loop Road
White Plains, NY 10604
Hotline: 1-866-328-1313
Phone: 914-328-1313
Email: info@corpangelnetwork.org
Memorial Sloan-Kettering Cancer Center, New York
Website: https://www.mskcc.org
Address: 1275 York Ave
New York, NY 10065
Phone: 212-639-2000
Email: publicaffairs@mskcc.org.
National Cancer Institute (NCI)
Website: https://www.nci.nih.gov
National Comprehensive Cancer Network
Website: https://www.nccn.org
Address: 275 Commerce Dr, Suite 300
Fort Washington, PA 19034
Phone: 215-690-0300
Native American Cancer Research
Website: https://www.natamcancer.org
Address: 3022 South Nova Rd.
Pine, CO 80470-7830
Phone: 303-838-9359
Email: info@natamcancer.net
Prevent Cancer Foundation
Website: https://www.preventcancer.org
Address: 1600 Duke Street, Suite 500
Alexandria, VA 22314
Hotline: 1-800-227-2732
Phone: 703-836-4412
Women's Cancer Resource Center
Website: https://www.wcrc.org
Address: 5741 Telegraph Avenue
Oakland, CA 94609
Hotline: 1-888-421-7900
Phone: 510-420-7900
Email: info@wcrc.org
Books
Coming Out of Cancer: Writings from the Lesbian Cancer Epidemic
by Victoria A. Brownworth
Melanoma Prevention, Detection & Treatment
by Catherine M. Poole and IV DuPont Guerry
Saving Your Skin: Prevention, Early Detection & Treatment of Melanoma & Other Skin Cancers
by Dr. Barney Kenet and Patricia Lawler
Skin Cancer Answer: The Natural Treatment for Basal and Squamous Cell Carcinomas & Keratoses
by William I. Lane and Linda Comac
Spanish-language resources
Medline Plus: Skin Cancer
Website: https://www.nlm.nih.gov/medlineplus/spanish/skincancer.html
Address: US National Library of Medicine
8600 Rockville Pike
Bethesda, MD 20894
Email: custserv@nlm.nih.gov
National Cancer Institute
Website: https://www.cancer.gov/espanol/tipos/melanoma
Address: NCI Public Inquiries Office
6116 Executive Boulevard, Room 3036A
Bethesda, MD 20892
Hotline: 1-800-422-6237
Email: NIAMSinfo@mail.nih.gov
HealthyWomen content is for informational purposes only. Please consult your healthcare provider for medical advice, diagnosis or treatment.