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What Is It?

A sarcoma is a cancer that develops from particular tissues, such as muscle or bone. In contrast, most cancers develop from organs that contain glands, such as the breast, colon, prostate and lung, among others.

There are two types of sarcoma: osteosarcoma, which develops from bone, and soft tissue sarcoma. Soft tissue sarcoma can arise from muscle, fat, nerves, cartilage, or blood vessels. Cancerous tumors can develop when abnormal cells in these tissues multiply and grow out of control. Scientists do not yet fully understand why these cells become abnormal. However, most cancers are thought to develop due to genetic changes (mutations).

Research we're watching

While more than three-quarters of Americans say that sun protection is important, less than half actually use it on a regular basis when they're heading outside, according to a survey by the American Academy of Dermatology. Some 28% of those polled said they rarely or never use sun protection, which includes using sunscreen, staying in the shade outside whenever possible, and wearing clothing such as hats or other items that can protect against the sun's rays. Sun exposure is the leading cause of skin cancers, affecting one in every five Americans, so the AAD says it's important that people take steps to protect themselves. The AAD recommends that you

• wear sunscreen with 30 SPF or higher
• stay out of the sun between 10 a.m. and 2 p.m., when its rays are the most intense
• use clothing to protect your skin, such as a hat and long-sleeved shirt.

Image: 漏 Aleksej Sarifulin/Getty Images

What does that skin spot or growth mean, and when should you have it checked?

Even if you're diligent about sun protection (and you should be), you can still develop skin spots, growths, or other abnormalities.

But are they always cause for concern, or just a normal part of aging skin?

What Is It?

Squamous cells are small, flat skin cells in the outer layer of skin. When these cells become cancerous, they typically develop into flat or raised, rounded skin tumors. Sometimes the skin around the tumors gets red and swollen.

Most cases of squamous cell carcinoma occur in people who have spent lots of time in the sun鈥攅specially those with fair skin and blue eyes. Some cases develop on skin that has been injured or exposed to cancer-causing agents. This type of squamous cell cancer can develop on:

A widely-advertised facial moisturizer claims to be the best on the market 鈥� and sells for $225 per bottle. Should you buy it? Another brand offers a complete skin care regimen 鈥� but it comes in 10 different bottles of lotions and potions that all need to be applied daily. Is it worth your time?

Despite manufacturers' claims, many cosmetic products will remove more cash from your wallet than dirt and oils from your skin. You don't need an expensive or lengthy skin care routine 鈥� and the good news is, the most effective and reliable regimen is also quick and inexpensive.

Learn to spot an actinic keratosis before it becomes cancerous.

About 58 million people have at least one actinic keratosis (AK), a precancerous skin growth caused by too much sun exposure.

Yet most people don't see the potential danger in these lesions because they are small, with few if any annoying symptoms, and can go away almost as fast as they appear.

In the journals

Zinc oxide (ZO) is one of the most effective ingredients in sunscreen, but previous studies have suggested it could potentially damage skin cells. Now, a small study in the February 2019 Journal of Investigative Dermatology has found that ZO nanoparticles don't penetrate the skin or damage skin on a cellular level even with repeated applications.

ZO is one of 17 active sunscreen ingredients approved by the FDA. ZO offers broad-spectrum protection and shields against both UVB rays, which cause sunburn, and UVA rays, which penetrate more deeply and are more likely to damage cell DNA and increase the risk of skin cancer.

Ask the doctor

听Image: 漏 AndreyPopov/Getty Images

Q. My doctor says I have a small skin cancer on my scalp, but it's not melanoma. Do I really need to have it removed?

A. It's true that melanoma is the most dangerous type of skin cancer, because it can spread throughout the body. You definitely need to have any melanoma removed, to try to excise it before it spreads. Two other types of skin cancer, basal cell carcinoma and squamous cell carcinoma, are more common than melanoma. It sounds like you have one of those. They spread only rarely, but they do grow larger. Not only is this disfiguring, but delay in removing them makes it harder to remove them with only a minimal scar. And cancers on the scalp, when they become large, can be particularly hard to remove.

Think you know a lot about skin and skin care? You might be surprised at how much "common knowledge" about keeping听your skin clear and healthy is simply not true.

Here, we debunk 10 common myths about skin.

1. The right skin cream can keep your skin looking young.

Ask the doctors

Q. Should pregnant or breastfeeding women and their children use sunscreen?

A. The American Academy of Dermatology recommends that people avoid applying sunscreen to the skin of babies younger than 6 months of age, and instead shield them from the sun, keeping them in the shade as much as possible. It's also a good idea to protect them from the sun using clothing, hats, and sunglasses.