Skin cancer is by far the most common type of cancer occurring in the United States. It is also the most rapidly increasing cancer.

For the past 30 years, skin cancers have been increasing by about three percent each year. One out of every five people in the U.S. will develop skin cancer sometime during his or her life. It is estimated that about 50 percent of all people who live to age 65 will develop at least one form of skin cancer.

“The good news is that skin cancer can be prevented, and if caught early, is treatable,” said Mamta Kalidas, M.D., a clinical oncologist with the Cancer Program at Memorial Hermann Northeast Hospital. “In fact, if detected early, skin cancer is almost 100 percent curable – that is why it is so important to get checked by a physician regularly and why we are hosting a screening program this fall.”

Dr. Kalidas points out that skin cancer can be divided into two major types: non-melanoma and melanoma skin cancer. Malignant melanoma is the more deadly of the two.

The American Cancer Society estimates that there will be more than three million people diagnosed with non-melanoma skin cancers in 2014. Approximately 76,100 people will be diagnosed with malignant melanoma.

Even though malignant melanoma is diagnosed far less often, Malignant melanoma takes more lives than any other type of skin cancer, causing about 9,710 deaths per year. That represents about one malignant melanoma death every hour.

Dr. Kalidas says the primary cause of all types of skin cancer is exposure to ultraviolet radiation (UV) — the sun. It is easy to get a sunburn in Texas because of the state’s geographic location, mild climate, and the many opportunities to work and play out of doors. Reflections of the sun’s rays off water or sand can double our ultraviolet radiation exposure.

Clouds don’t block out UV rays. When the weather is cloudy, cool, and breezy, we may not become hot or realize the amount of UV exposure until after we have developed a sunburn.

Studies suggest that heavy sunlight exposure in the first few decades of life may be of the greatest importance in determining a person’s risk for skin cancer. A blistering sunburn in childhood or adolescence doubles the risk of developing a skin cancer.

It is estimated that by the time someone reaches the age of 18 they have already obtained 80 percent of their lifetime UV light exposure.

Besides avoiding the sun, early diagnosis and treatment are the next best prevention options, says Dr. Kalidas.

Dr. Kalidas suggests that you make it a habit to check your skin for abnormalities and changes. Look at each of your moles and evaluate them using the following ABCD test recommended by the American Melanoma Foundation:


  • Asymmetry – When the lesion is divided into halves, if the right half does NOT look like the left half, it is asymmetrical in shape.
  • Border – Moles that have irregular or poorly defined borders should be reported. The borders appear notched or seem to fade or “stream out” onto the surrounding skin.
  • Color – Is the color of the mole varied? Does the mole have tan, brown, black, blue, red, or white areas?
  • Diameter – Is the mole larger than six millimeters in diameter (the size of a pencil eraser)? Although six millimeters is used as a general guideline for evaluating growth of a mole, any mole that is asymmetrical, has an irregular border, has color variations, and is changing should be evaluated by your Memorial Hermann health care provider — even if it is less than six millimeters in diameter. A positive finding of any of the ABCDs may indicate the mole is a malignant melanoma.

Malignant Melanoma can develop anywhere on your skin, so wear appropriate protective attire including long sleeves and hats, avoid working in the sun if possible, use sunscreens, and do regular self-examinations. Protect your eyes from the harmful ultraviolet rays by using gray or brown lenses that offer both UVA and UVB protection.

A cancer-related checkup including skin exam is recommended every three years for persons between the age of 20 to 40 years, and every year age 40 and older.

Take charge of your skin. Get regular checkups and take precautions when you are out in the sun. As the slogan from Cancer Council Victoria in Australia says, remember to “Slip, Slap, and Slop.”

  • Slip on a long sleeve shirt.
  • Slap on a hat
  • Slop on some sunscreen to protect your skin from the sun’s damaging rays!

For more information on skin cancer, visit the CDC skin cancer website.