Definition of the Skin Cancer and Types 2019

Skin Cancer.
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What is Skin Cancer?

Skin cancer is an abnormal skin cell growth, it generally develops in areas that are exposed to the sun, but it can also form in places where sun exposure does not normally occur.

Skin cancer is the growth of abnormal skin cells uncontrolled, it occurs  when skin cells are damaged by unrepaired DNA (most frequently caused by sunshine ultraviolet radiation or tanning beds), triggers mutations or genetic defects leading to rapid multiplication of skin cells and the formation of malignant tumors.

When some cells in the body are damaged, people get cancer and start  growing too fast, these growing cells make tumors known as spots or bumps, no one knows why some people get cancer and not others.

Many different things can cause cancer, and doctors sometimes don’t know what causes cancer, but they know for certain that one of the things that causes skin cancer is the sun, skin cancer can also develop on less exposed areas of your body,

such as these locations:

  • scalp
  • ears
  • lips
  • neck
  • under your fingernails
  • bottoms of your feet
  • genitals

Types of Skin Cancer.

  • Basal cell carcinoma.
  • Melanoma.
  • Nonmelanoma skin cancer.
  • Squamous cell carcinoma of the skin.

Basal cell carcinoma:

A type of skin cancer is basal cell carcinoma, basal cell carcinoma begins in the basal cells, a type of skin cell that generates new skin cells as older cells die off.

basal cell carcinoma often appears on the skin as a slightly transparent bump, though other forms may be taken, basal cell carcinoma most often occurs in areas of the skin, such as your head and neck, that are exposed to the sun.

According to the American Cancer Society, more than 80% of the more  than 3 million cases of skin cancer diagnosed each year are basal cell carcinoma.


Melanoma, the most severe type of skin cancer, develops in melanin-producing cells (melanocytes), the pigment that gives color to your skin. in your eyes and rarely in internal organs, such as your intestines, melanoma may also form.

Melanoma is the deadliest form of skin cancer:

  • It is crucial for early diagnosis and treatment.
  • Melanoma often develops in a mole or as a new dark spot on the skin suddenly appears.
  • You may find an early melanoma by knowing the ABCDE warning signs of melanoma.

Use the “ABCDE” method to determine whether melanoma can be a mole or a freckle. If any of these symptoms apply, you will want to see your doctor.

  • A: asymmetrical.
  • B: border
  • C: change in color.
  • D: diameter.
  • E: evolving.

The exact cause of all melanomas is not clear, but your risk of developing melanoma is increased by exposure to ultraviolet (UV) sunlight radiation or tanning lamps and beds, limiting your UV exposure can help lower your melanoma risk.

Nonmelanoma skin cancer:

Nonmelanoma skin cancer refers to all types of skin cancer not melanoma that occur in the skin, various types of skin cancer fall into the broader category of nonmelanoma skin cancer, with basal cell carcinoma and squamous cell carcinoma being the most common types.

Treatment for nonmelanoma skin cancer depends on the cancer type,  treatment for skin cancer usually involves surgery for cancer cells to be removed.


  • Angiosarcoma.
  • Basal cell carcinoma.
  • Cutaneous B-cell lymphoma.
  • Cutaneous T-cell lymphoma.
  • Dermatofibrosarcoma protuberans.
  • Merkel cell carcinoma.
  • Sebaceous carcinoma.

Squamous cell carcinoma of the skin:

These cancers are the second most common type of skin cancer, representing about 20% of non-melanoma skin cancers, they develop from the flat squamous cells that constitute a great deal of epidermis, the skin’s outermost layer.

The skin’s squamous cell carcinoma is a common skin cancer form that  develops in the squamous cells that make up the skin’s middle and outer layer, the skin’s squamous cell carcinoma is not usually life-threatening, although in some cases it may be aggressive, untreated, skin squamous cell carcinoma may grow big or spread to other parts of your body, causing severe complications.

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