Skin CancerSkin cancer occurs when skin cells start growing abnormally, causing cancerous growths.
Most skin cancers develop on the visible outer layer of the skin (the epidermis), particularly in sun-exposed areas (face, head, hands, arms, and legs). They are usually easy to detect by examining the skin, which increases the chances of early treatment and survival.
There are different types of skin cancer, each named for the type of skin cell from which they originate. The majority of skin cancers fall into one of the following categories:
Skin cancer is considered low risk when the affected cells remain clustered in a single group. It is considered high risk when the cells have invaded surrounding tissues. High risk forms of cancer require more aggressive treatments.
Almost all skin cancers start as a small, low-risk lesions, but can grow and become high-risk lesions if left untreated. Melanoma is the most alarming type because it has a higher risk of invading surrounding tissues or spreading to other parts of the body (metastasis) before being detected. Squamous cell and basal cell skin cancer are more likely to be detected and treated effectively before they become malignant.
If skin cancer is detected before it has spread to surrounding tissues, chances of a complete cure are excellent.
Skin cancer may often be preceded by lesions called pre-cancers. The most well-known of these are actinic keratoses (AKs). Actinic Keratoses are considered an early form of squamous cell carcinoma.
Actinic Keratoses, a new or changing mole (nevi), and other unusual lesions on your skin should be carefully monitored and brought to the attention of your doctor.
Diagnosing cancer usually requires a biopsy. A small piece of skin is removed for examination under a microscope and evaluated with other tests.
A treatment plan will be recommended based on several factors:
Treatment options include:
Sunlight is composed of visible light (all the colors we see in daylight), infrared radiation (which provides warmth), and ultraviolet (UV) radiation, which is carcinogenic (cancer-causing). More than 90 percent of all skin cancer is caused by long-term exposure to UV radiation.
UV radiation damages the skin’s DNA, causing a cell to behave abnormally. The body normally has mechanisms to repair damaged DNA but these repair mechanisms do not function normally after exposure to UV radiation. This allows the abnormal skin cell to replicate itself, making more cells with the same damaged DNA. This growing collection of abnormal cells is the beginning of a cancer.
The immune system can often detect and destroy cancer cells, just as it defends against infections by bacteria or viruses. However, UV radiation disrupts the immune system so that our natural defenses may not detect the cancer, allowing it to grow unchecked.
Melanin in the skin, which gives skin its tan to brown color, can block the damaging effects of UV radiation. The more melanin, the darker the skin. And the darker the skin, the better protected it is from UV radiation. This is why a body darkens when exposed to sunlight (tanning). It is trying to build a better shield.
However, the melanin provides only partial protection, even for those with very dark skin. And those with fair skin have almost no melanin to protect them.
It is important to remember that a tan develops only after the skin has been damaged by UV radiation, and that this tan provides only minor protection from additional damage.
In addition to sun exposure, family history may also play a role in a small percentage of skin cancers, especially melanomas.
The best protection against skin cancer is to minimize sun exposure, especially between 10 a.m. and 4 p.m. If you do go out in the sun, use a broad-spectrum sunscreen (SPF 30 or higher that protects against UVA and UVB), making sure to cover the head, lips, hands, neck, and ears. Wear a wide-brimmed hat, sunglasses, and protective clothing. Not only will this dramatically decrease your risk of skin cancer, but it will prevent other sun-damaging conditions, like wrinkles and actinic keratoses.
While everyone should minimize their exposure to the sun, fair-skinned people, outdoor workers, and residents of sunny climates should use particular caution.
Another effective weapon against skin cancer is regular self-exams of your skin. Get to know the landscape of your skin, and take an inventory of all moles.
Because skin cancer can resemble other skin conditions, be sure to tell your doctor about unusual skin changes or lesions, especially these:
Tanning booths increase the risk of developing skin cancer, despite any claims of their being a safe alternative to natural sunlight. The skin doesn’t tan unless it is first damaged by UV radiation. Intentional tanning should be avoided like any health hazard, such as smoking.
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