Hori’s naevus appear as bluish-grey discolouration on both sides of the face. The bluish colour is a result of the Tyndall effect. It most commonly affects the cheeks, upper lip and bridge of the nose (malar region) though it can also involve the forehead, temples, eyelids and alae of the nose. Hori’s naevus is also commonly referred to as acquired bilateral naevus of Ota-like macules (ABNOM) due to its similarities in appearance to naevus of Ota or acquired dermal melanocytosis (ADM). Unlike naevus of Ota, Hori’s naevi is non-existent at birth and affects the face bilaterally. This skin disorder mainly affects people of Asian heritage and is often be accompanied by other pigmentary disorders such as Melasma or Solar Lentigos.
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Hori’s naevus is the result of hormones or genetics. Where the melanin-producing cells are only present in the upper skin layer and the hair follicles for most people, in certain cases the cells may be present even in the dermis which is the underlying skin area. This presence of cells is called dermal melanocytosis.
Hori’s naevus is one among many conditions included under dermal melanocytosis.
In order to carry out a hori’s naevus treatment, diagnosis is made through clinical examination.
Much like other pigmentary conditions Hori’s naevi responds well to laser treatment.
The Q Switch laser is the arsenal of choice to effectively treat Hori’s naevus pigmentation. A combination of various Q Switch wavelengths and fractional laser is often more effective than a single modality. The number of treatments required depends on the intensity of pigment and depth of pigments. A comprehensive consultation by the experienced Dermal Clinicians at Melbourne Laser & Aesthetic Centre is necessary to properly assess the condition.
The Q Switch laser hori’s naeus treatment has very minimal downtime. Once the procedure is conducted, you can resume your regular activities. However, your skin may be tender for a couple of days immediately after treatment. It is advised to avoid sun exposure and apply a sunscreen through the treatment period.
Immediately after the hori’s naevus treatment, the pigmented area will appear darker in colour with the general area mildly inflamed. The treatment is kept comfortable with a cool stream of air or contact cooling. The colour of the pigmented areas may appear darker following treatment. Any superficial pigment will flake off in the following 7 days after the treatment; otherwise the deeper pigment will gradually lighten over the following weeks. The number of treatments required depends upon the intensity of pigment, the placement within the skin and the type of laser modality combination used.