Skin mole

Introduction Skin sputum can be found in everyone's body. If you carefully examine the whole body, it is estimated that normal people have an average of 15 to 20 baboons per body, and more than 50 baboons. Its size ranges from point-like, rice-like scorpions to giant pythons that occupy the face, trunk and limbs. The colors are yellowish brown, tiled blue, light blue, grayish black, black ink and so on. In addition to affecting the appearance of benign skin, there is no self-conscious symptoms, malignant pigmented nevus is converted into malignant melanoma, the condition is very sinister, and the course of disease progresses rapidly.

Cause

Human skin tissue is composed of epidermis, dermis and subcutaneous tissue, and pigment cells are present in the skin. Due to differences in morphology and composition of melanin of different races, there are white, black, yellow, brown and other races. Any race can produce oysters. It is generally believed that the sputum cell nest originates from melanocytes in the epidermis, and it is also thought that the neural crest precursor cells from the embryonic phase gradually migrate to the surface of the skin. Therefore, some babies have been born at birth, commonly known as "fetal sputum."

an examination

Related inspection

Urine analysis immunopathology

Common skin blemishes are benign skin blemishes, often without health damage to the human body, only affecting beauty. Malignant skin blemishes are more common in malignant melanoma and are an acute and dangerous disease. Common symptoms are:

1 color: Most malignant melanomas have brown, black, red, white or blue mixed unevenness. When the skin color changes, it should be especially vigilant.

2 edge: often jagged changes in a zigzag, resulting in the spread of the tumor to the surrounding or self-degeneration.

3 surface: not smooth. Often rough with scaly or flaky desquamation. Sometimes there is exudation or oozing, and the lesion can be higher than the skin.

4 The skin around the lesion may have edema or loss of original skin luster or white or gray.

5 paresthesia: local itching, burning or tenderness.

Differential diagnosis

Clinically often identified with pigmentation.

Pigmentation: It is the change of pigmentation of human skin with different colors, different ranges and different shades due to various reasons. In terms of human skin, there are two types of pigments: one is a pigment produced by the body itself, such as melanin produced by melanocytes present in the skin. Due to the different shades of melanin, different shades are displayed: black or brown in the epidermis, grayish blue in the shallow layer of the dermis, and cyan in the deep layer of the dermis. Endogenous pigments include lipoproteins and biliary pigments. The other type is exogenous foreign pigments, such as carotene), drugs (such as arsenic can cause skin yellowing, etc.) and heavy metals (such as arsenic, strontium, silver, etc.) and foreign bodies Coloring, such as tattoos, silt, iron slag, cinder, etc. in the skin's stagnation.

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