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Nevus Ota

Nevus Ota

This is a disorder of pigmented birthmark.

Nevus of Ota: presents as harmless flat skin pigmentary disorder lesion. There are 1. blue-grey to slate-brown in color. 2. They occurs as small spot and coalesce to form larger patch pigmentation. 3. They are located on the forehead, around the eye, even the scelera, the white portion of the eye ball, and may even reach the palate. 4. The condition usually presence since birth

Nevus of Ota: presents as harmless flat skin pigmentary disorder lesion. There are
1. blue-grey to slate-brown in color.
2. They occurs as small spot and coalesce to form larger patch pigmentation.
3. They are located on the forehead, around the eye, even the scelera, the white portion of the eye ball, and may even reach the palate.
4. The condition usually presence since birth

This is also called by various name as Nevus of Ota (NOO). The condition is quite similar to Nevus of Itu (NOI).

 

Features of Nevus of Ota

Nevus of Ota presents as harmless flat skin pigmentary disorder lesion. There are

  • blue-grey to slate-brown in color.
  • They occurs as small spot and coalesce to form larger patch pigmentation.
  • They are located on the forehead, around the eye, even the scelera, the white portion of the eye ball, and may even reach the palate.
  • The condition usually presence since birth

 

 

 

 

Nevus of Ito: Features of Nevus of Ito 1. same discoloration as the Nevus of Ota, 2. found on the shoulder and upper arm 3. present since birth

Nevus of Ito:
Features of Nevus of Ito
1. same discoloration as the Nevus of Ota,
2. found on the shoulder and upper arm
3. present since birth

 

 

Nevus of Ito

Features of Nevus of Ito:

1. same discoloration as the Nevus of Ota,
2. found on the shoulder and upper arm
3. present since birth

 

Features of Nevus of Hori

  • it is always bilateral
  • symmetrical
  • spotty lesions rather than patches

 

 

Note: The condition is very often misdiagnosed. This is because it may resemble or coexist with melasma. It self also can cause an uneven skin tone. 

Causes

The precise cause is unknown. However, GNAQ or GNA11 mutations have been found  in the dermal melanocytes seen in this condition.  Hormones may play a role.

In a normal skin, the melanocyte, which is the melanin-producing pigment cells are present only in the upper layer of skin (the epidermis) and hair follicles. There are present at the basement membrane of the epidermis.

In abnormal condition, however, when these cells are present, for whatever reason,  in the underlying area of skin, called the dermis, it causes a condition known as dermal melanocytosis. This is abnormal.

Dermal melanocytosis is a spectrum of conditions and includes

  • Mongolian spots,
  • naevus of Ota,
  • Hori’s naevus and
  • naevus of Ito.

In the dermal melanosis, the melanin is present more deeply in the skin. The colour changes from black-brown to blue-grey when it becomes deeper sited.

Clinical signs of Nevus of Ota

Nevus Ota  presents as

  • unilateral instead of bilateral
  • not symmetrical
  • small spot lession connected into a patch, slate-brown, bluish and grey
  • on the forehead, cheek, around the eye, may be scelera

Naevus  of Ota diagnosis

The diagnosis is based on clinical findings during physical examination. The signs of Nnevus of Ota as described is the classic finding. It is always unilateral and NOT symmetrical. Location is usually on the forehead, cheeks and around the eye.

 

 

 

Nevus of Ota: presents as harmless flat skin pigmentary disorder lesion. There are 1. blue-grey to slate-brown in color. 2. They occurs as small spot and coalesce to form larger patch pigmentation. 3. They are located on the forehead, around the eye, even the scelera, the white portion of the eye ball, and may even reach the palate. 4. The condition usually presence since birth

Nevus of Ota: presents as harmless flat skin pigmentary disorder lesion. There are
1. blue-grey to slate-brown in color.
2. They occurs as small spot and coalesce to form larger patch pigmentation.
3. They are located on the forehead, around the eye, even the scelera, the white portion of the eye ball, and may even reach the palate.
4. The condition usually presence since birth. Note: the only effective treatment is by laser. 

 

Treatment

The only single successful treatment for Nevus of Ota is by pigment laser. Read more here. Nevus of Ota treatment.