Nevus of Ota is a benign pigmented skin disease that invades the sclera and the skin of the trigeminal nerve distribution. The lesions are brown, blue or blue-brown in color and range from a few centimeters in diameter to large patches, with large ones invading the unilateral or bilateral face. The disease occurs mostly in Asian people of color, and the incidence in China is about 16 per 1,000, with more women than men (male to female ratio of 1:2.67), most of them are congenital, and very few develop after adulthood. The pathological manifestation is that the melanocytes which should be distributed in the basal layer of epidermis are lost in the dermis, forming unsightly pigmented spots.
Nevus of Ota does not affect physical health but is an aesthetic problem
Although nevus of Ota is a widespread lesion, it is a benign lesion and generally has no effect on physical health. However, because it is located in a prominent position on the face, it has a great impact on the image, so patients try every possible way to seek treatment. The principle of treatment should be to remove the pigment without leaving a scar. In the past, various treatments, such as freezing, skin grinding, skin peeling, radionuclide and herbal treatment, were not effective. Even surgical implantation or flap repair in plastic surgery left unsightly scars and the color of the implanted area would be inconsistent with the surrounding skin; it was not until the introduction of Q-switched laser technology that the treatment of nevus of Ota brought a new hope for complete cure.
Laser treatment for nevus of Ota does not leave scars
The broken cells and melanin are engulfed by phagocytic cells and transferred through the lymphatic system, and finally discharged through the kidneys. Since the wavelength of laser is extremely pure, the normal tissues without melanin absorb very little, and the extremely short pulse width ensures that the surrounding normal tissues are not damaged.
Laser treatment for nevus of Ota is usually carried out once every three months and can be cured in 4-9 times. Generally, the darker the lesion is, the longer the treatment course is, but in the end, it can be completely cured without leaving a scar. No recurrence has been reported.
How to treat
The Q-switched 755nm laser, imported from the United States, acts selectively on pigment particles in the epidermis and dermis through selective photothermal action, causing the pigment particles to be broken up by heat for easy absorption by cells in the body. Since its time of releasing energy is lower than the time of melanin’s thermochromic valve, the heat generated is not transmitted to the surrounding tissues and epidermis, causing no damage to normal skin. From the current scope of application in the country, the Cytoxan Q-switched Emerald Laser System is one of the best laser machines for treating a variety of pigmented skin diseases, and its wide range of indications, thoroughness of pigmentation removal, and safety of treatment are especially suitable for the skin type of Oriental people. From the current treatment situation, the efficiency rate has reached over 90%.
Reactions after laser treatment of nevus of Ota
1.After laser treatment of nevus of Ota, the skin will be slightly red, swollen, oozing and spotted bleeding, which can be treated without bandages.
2.After laser treatment of nevus of Ota, the next day, the red bleeding area will dry into black blood scab and swelling of different degrees will appear. The blood scab will start to fall off from the 5th day, and the time of scab removal varies according to the age, and it will take 10 days for individuals to get rid of the scab.
3, after the blood scab off, you can reveal fresh, light pink, or black-red delicate skin.
4.For shallow and light-colored nevus of Ota, pink and clean tissues can be seen after the first treatment, while for deeper nevus of Ota, black-red lesions can still be seen after the scabs fall off. 15 days later, pigmentation will gradually appear on the fresh skin, and the pigmentation will be most obvious in about 30 days.
5, a few people can appear obvious temporary hyperpigmentation or hypopigmentation, generally after a few months can be restored, very few darker color, can appear mild skin atrophy.
Carefully clean the facial skin before treatment. Avoid sunlight as much as possible after treatment, and do not touch water or topical medication in the treatment area to prevent infection. Do not take aspirin-type drugs for a period of time after treatment to avoid affecting the recovery of the skin. Do not drink alcohol or eat irritating food for a week.
Contraindications.
1, pregnant women.
2. people with photosensitive skin, such as systemic lupus erythematosus and other partial autoimmune diseases.
3.Patients with diabetes mellitus.
4.People suspected of having skin cancer.
5.People with keloid.
6.Persons who have undergone chemical peeling, physical grinding and other skin peeling procedures.
7, use of retinoid medication within the last year.
8, unwilling to sunscreen and accept the risk of abrasion within 6 months after surgery, etc.