Moles, also known as dark pigmented nevi, are benign tumors that almost everyone has, and generally do not become malignant, especially hairy moles are less likely to become malignant. According to statistics, there is 1 person in every 100,000 who has cancerous nevus. Although this ratio is not large, melanoma produced by cancerous nevus is a highly malignant, early metastatic and dangerous tumor, which can generally kill the patient within 1-2 years if not treated in time. (Growth in the hands, feet, scalp and other places vulnerable to friction stimulation is likely to malignant)

Moles are divided into four kinds:

Skin tumors refers to the occurrence of intradermal or subcutaneous tissues of the neoplasm, there are a lot of types, clinically divided into benign tumors and malignant tumors. The first requirement is to improve the vigilance to malignant tumors, pay attention to perceive early symptoms, and observe closely.

<Skin tumor self-testing>

Junctional nevus: located at the junction of epidermis and dermis. It is mostly seen on the palms of the hands, soles of the feet, lips of the mouth and external genital areas. The surface is flat or slightly high, the size is between 1-2 millimeters, light brown, brown-black or blue-black. There is a possibility of cancer, which can occur as melanoma.

Intradermal nevus: exists in the dermis. The surface is smooth and the boundary is clear. Larger than 1 mm, flaky growth, flat or slightly elevated. The color is darker and uniform, light brown, dark brown or ink black. Generally not cancerous.

Mixed nevus: it is a mixture of the above two, usually like intradermal nevus, and can be cancerous because it has the components of junctional nevus.

Blue nevus: the surface collagen beam light reflection due to the presence of pigment cells is blue, so it is called blue nevus. It is relatively rare and occurs mostly in childhood. It occurs on the arm, the back of the hand, and the back of the foot. Mostly benign, but occasionally cancerous.

The exact cause of malignant melanoma is not clear, and the possible causes are ultraviolet radiation, trauma and stimulation by adverse factors, genetic and endocrine factors, immunocompromise or immunodeficiency.

The following items can be checked to determine whether there is a possibility of early cancer:

Color, the skin color of the nevus is mixed, such as red, white or blue;

Edge, the edge of the skin at the nevus is jagged and jagged;

Surface, the surface of the nevus is not smooth, elevated and accompanied by flakes of flakes, with oozing or bleeding;

Surface, the surface of the nevus is not smooth, elevated and accompanied by flakes of flakes, with oozing or bleeding;

Edema of the surrounding skin.

Surrounding skin edema, loss of skin luster or whitening or graying;

Itchy, burning and pressure pain;

Localized nodular or polypoid swellings or ulcers with oozing and bleeding;

Other black nodules around the nevus.

The above phenomena are signals of cancer. In addition, the moles on the hands, feet, and perineal area may also become malignant, especially the "mole spotting" operation that attempts to eliminate the moles often leads to the occurrence of malignant melanoma.

Therefore, you should not apply all kinds of physical and chemical stimulation to moles, such as needle picking, knife gouging, and medicine pointing corrosion. The signs of malignant nevus are sudden enlargement or redness, itchiness, oozing or bleeding, which should be treated by a surgeon immediately. Where the hands, feet, head and face of the nevus if you want to get rid of, must ask the surgeon in accordance with the medical routine thoroughly excision, can not be arbitrarily disposed of.