What does Nevus of Ota look like

Many people may not have heard of Nevus of Ota, but once you see it, you may be left with a deep impression. Nevus of Ota is caused by abnormal proliferation of dermal melanocytes. Nevus of Ota is generally very large, and if it appears on the face, it will have a great psychological impact on the patient. However, it is currently possible to effectively remove the nevus of Ota. Therefore, if you feel that this type of Ota nevus has a great impact on you psychologically, you can choose to remove it.

Basic Information:

Nevus of Ota is a benign skin tumor of dermal melanocytic proliferation. It not only manifests as pigmentation of the skin and mucous membranes, but can also affect other organs, presenting a series of complications from the nevus of Ota. It is named because it was first systematically described by Japanese doctor Ota (OTA) in 1939.

Ota nevus is more common in Asians and blacks, but rare in Caucasians. In Japan, the incidence rate is reported to be 0.89%, while a domestic survey showed it to be 0.16%, which is lower than the Japanese level. Nevus of Ota is more common in women, with a male to female ratio of approximately 1:4. The age of onset ranges from birth to 80 years old, with approximately 55% of patients developing the disease within 2 years of birth, and most of the rest developing the disease between the ages of 2 and 10. Few develop the disease after puberty. According to a survey, 23.3% of patients develop the disease at birth, 25% develop the disease between 0 and 1 year old, 10.8% develop the disease between 1 and 10 years old, 36.2% develop the disease between 11 and 20 years old, and 4.6% develop the disease between 21 and 26 years old. It can be seen that there are two peak incidence periods of Ota nevus: infancy and adolescence, which may be related to the fluctuation of pituitary hormone levels.

Ota's nevus is common in the following ethnic groups:

Nevus of Ota and Nevus of Ito are common in people of color, such as Orientals and blacks. The skin lesions are patches or spots ranging from light blue, gray-blue, brown-blue to blue-black or brown-yellow. The color is dark in the center and gradually lightens at the edges. Occasionally, some areas of the pigmented spots may be raised or even form small nodules ranging in size from millet to mung bean. The spots are distributed in clusters with varying densities, or with patches in the center and spots on the edges. The color of skin lesions worsens due to sun exposure, fatigue, menstruation, and pregnancy. Some become deeper and larger during puberty.

Common parts:

The most commonly affected areas of this disease are the periorbital, temporal, forehead, zygomatic and nasal alar areas, which are equivalent to the distribution areas of the first and second branches of the trigeminal nerve; it is unilaterally distributed, occasionally bilaterally (about 10%), and about 2/3 of the patients have blue staining on the same side of the sclera. The conjunctiva, cornea, iris, fundus, optic nerve head, optic nerve, retrobulbar fat and periorbital periosteum may also be affected.