Anemia nevus is generally distributed unilaterally or confined to a certain part or occurs soon after birth, and rarely continues to expand in the future, with the same shape. Its color is hypopigmentation, not depigmentation. After rubbing or heating hard, the local area does not turn red, and the surrounding normal skin turns red. After diagnosis with slide, the edge of the lesion is more blurred. According to the above characteristics, it can be differentiated from vitiligo.

This paragraph is characterized by localized superficial skin spots, where vascular tissue is deficient in development, but not in structure but in function. Patients with neurofibroma are more likely to have this disease than normal people.

The reason of this paragraph is that the sensitivity of blood vessels to catecholamine increases, while local blood vessels are always in a state of contraction, resulting in local skin ischemia and white spots.

The clinical symptoms of this paragraph occur after birth or in childhood, or they can occur late, and the incidence of male and female is equal. It usually occurs on the face, neck or buttocks. Unilateral, the skin lesions are pale white patches with unclear boundaries and irregular shapes, and the skin texture has not changed. It is a single or multiple circular, elliptical or irregular light spots. Pressing with a glass slide is not easy to distinguish from the surrounding whitening skin; Or rub the part with the palm of your hand, and the surrounding skin is red, but the light spot is not red. This disease can occur anywhere, but the trunk is the most common. Never fade. Anemia nevus is heavy and obvious in winter, but light and not obvious in summer.

There is no abnormality in this lesion, but the reactivity of local blood vessels to catecholamine is enhanced, and the blood vessels are in contraction state, which belongs to functional abnormality.

Edit this paragraph to prevent anemia nevus. Drugs that dilate blood vessels can be used externally, such as 5% capsaicin ointment.

Edit this paragraph to distinguish anemic nevus from vitiligo and amelanotic nevus. Their respective characteristics are as follows:

Vitiligo is completely different from normal skin tissue, and its surrounding skin color is obviously aggravated. Press down vertically with a clean glass slide, and the white point boundary will be clearer.

Anemia nevus is just the opposite of vitiligo. Anemia nevus is only local hypopigmentation, not depigmentation. Therefore, there is no obvious boundary between the concave part and the normal skin, and there is obvious "tree texture" in the anemic nevus area. Anemia nevus has no tendency to expand. It rubs the skin lesions hard, and the local area is not red, while the surrounding normal skin is red. Anemia nevus will disappear when pressed with a glass slide.

The amelanotic nevus is equivalent to the abnormal development of melanin in a certain area, which is congenital, but it can not be shown immediately after birth, which is also the reason why it is easily confused with vitiligo. The growth of vitiligo is random. With the change of seasons, the area will be different, and it can be reduced after regular treatment. Once the amelanotic nevus is formed, its size is basically fixed, and its development speed and increase speed are directly proportional to the physical development.