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Naevus Spilus: Causes, Diagnosis and Treatment

Naevus spilus is a benign skin lesion appearing as a light brown patch with darker speckled spots. It is generally harmless but should be monitored regularly by a dermatologist.

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Things worth knowing about "Naevus spilus"

Naevus spilus is a benign skin lesion appearing as a light brown patch with darker speckled spots. It is generally harmless but should be monitored regularly by a dermatologist.

What is Naevus Spilus?

Naevus spilus (also referred to as nevus spilus, speckled lentiginous naevus, or zosteriform lentiginous naevus in specific presentations) is a benign, congenital or early-childhood acquired skin lesion. It appears as a light brown, flat background patch -- resembling a cafe-au-lait macule -- studded with multiple smaller, darker brown to black dots or papules. These darker inclusions represent small nests of melanocytes, the pigment-producing cells of the skin.

The term originates from Latin and Greek roots: naevus meaning birthmark and spilus derived from the Greek word for spot. Naevus spilus occurs in approximately 0.2 to 2 percent of the general population and can appear on any area of the body, most commonly on the trunk or extremities.

Causes and Origin

The precise cause of naevus spilus is not yet fully understood. It is believed that somatic mutations occurring during early skin development play a key role. The following factors are discussed in the medical literature:

Genetic predisposition and somatic mosaic mutations
Disruptions in the migration and differentiation of melanocytes during embryonic development
In some cases, an association with RAS gene mutations, particularly involving the HRAS gene, has been identified

Naevus spilus may be present at birth or develop during the first years of life. The number of darker inclusions may increase over time as the individual ages.

Appearance and Symptoms

Naevus spilus is typically asymptomatic and causes neither pain nor itching under normal circumstances. Its characteristic features include:

A light brown to beige background macule ranging from a few millimeters to several centimeters in diameter
Smaller, dark brown to dark black dots or papules scattered within the background patch
Smooth or slightly irregular borders
No signs of inflammation in most cases

Depending on its size, naevus spilus is classified as small (less than 10 cm in diameter) or large (greater than 10 cm), with larger lesions carrying a slightly elevated risk of changes or malignant transformation.

Diagnosis

Diagnosis is typically made clinically by an experienced dermatologist. The following methods are used:

Clinical inspection: Assessment of the characteristic appearance, including the background patch and speckled inclusions
Dermoscopy (dermatoscopy): Magnified examination of the skin surface to assess the structure and nature of the inclusions in greater detail
Histology (tissue examination): In cases of uncertain or suspicious findings, a biopsy is performed. Microscopic analysis can differentiate between various melanocyte nest types (junctional, dermal, or compound naevi)

Regular follow-up examinations and photodocumentation are strongly recommended, particularly for large-sized naevus spilus.

Malignant Potential and Risks

Although naevus spilus is generally considered benign, there is a rare but recognized risk of melanoma (malignant melanoma) development, particularly within the darker inclusions. This risk is generally low overall but is elevated in larger lesions or when individual inclusions show changes. Warning signs -- based on the ABCDE criteria -- include:

A – Asymmetry of an inclusion or the background patch
B – Irregular or poorly defined border
C – Color variation or new shades (e.g., red, white, blue-black)
D – Diameter greater than 6 mm or progressive enlargement
E – Elevation or evolving changes (itching, bleeding, crusting)

Treatment

For an uncomplicated, stable naevus spilus, no treatment is generally required. The following management options are discussed based on individual findings:

Observation and monitoring: Regular dermatological check-ups (at least once per year) with photodocumentation
Surgical excision: Recommended for suspicious inclusions or upon the patient's explicit request (e.g., for cosmetic reasons)
Laser treatment: In selected cases, laser therapy may be used to treat the background macule; however, individual inclusions may not be fully eliminated, and ongoing follow-up remains necessary

In children with large naevus spilus, close surveillance and consideration of early surgical intervention are recommended by most dermatological guidelines.

References

Happle R. - Speckled lentiginous nevus: which of the two disorders do you mean? - Clinical and Experimental Dermatology, 2009; 34(2): 133-135.
Seidenari S. et al. - Naevus spilus: clinical, dermoscopic and histopathological study - British Journal of Dermatology, 2007; 156(6): 1229-1234.
Schaffer J.V. - Pigmented lesions in children: when to worry - Current Opinion in Pediatrics, 2007; 19(4): 430-440.

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