Nevus Spilus
A nevus spilus, commonly referred to as a speckled lentiginous nevus, is a distinct type of pigmented birthmark. Characterized by its unique appearance, it typically presents as a light brown or tan patch of skin that is "speckled" with smaller, darker spots or tiny bumps. These lesions are generally benign and are studied within the field of dermatology.
Key Facts
- Common Names: Also known as speckled lentiginous nevus.
- Appearance: A tan or light brown background with darker spots or small papules.
- Prevalence: Occurs in approximately 0.2% to 2.8% of the population.
- Variations: Can appear in a segmental pattern, known as Zosteriform speckled lentiginous nevus.
- Associations: May be linked to phakomatosis pigmentovascularis (a group of disorders involving pigmentary and vascular anomalies).
Clinical Presentation and Variations
The hallmark of a nevus spilus is the contrast between the background pigmentation and the superimposed dark spots. While the overall patch is light brown, the smaller, darker elements give it a "speckled" look. These lesions can vary in size; for example, a typical presentation may measure approximately 3 cm x 4 cm.
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Zosteriform Pattern
In some cases, the birthmark does not appear as a simple patch but instead follows a segmental distribution on the body. When this specific pattern occurs, the condition is referred to as a Zosteriform speckled lentiginous nevus.
Associated Conditions
While often an isolated finding, nevus spilus may be associated with phakomatosis pigmentovascularis, a rare syndrome characterized by the coexistence of cutaneous pigmentary anomalies and vascular malformations.
Summary Table
| Feature | Description |
|---|---|
| Alternative Name | Speckled lentiginous nevus |
| Primary Color | Light brown or tan |
| Distinguishing Mark | Small dark spots or bumps |
| Prevalence Rate | 0.2% to 2.8% |
| Segmental Variant | Zosteriform speckled lentiginous nevus |
Frequently Asked Questions
What is a nevus spilus?
It is a light brown or tan birthmark that contains smaller, darker spots or small bumps, also known as a speckled lentiginous nevus.
How common is this condition?
The prevalence of nevus spilus is estimated to be between 0.2% and 2.8% of the population.
What is a Zosteriform speckled lentiginous nevus?
This is a specific variation of nevus spilus that occurs in a segmental pattern on the skin.
Is nevus spilus related to other medical conditions?
It may be associated with types of phakomatosis pigmentovascularis, which are disorders involving both pigmentary and vascular issues.
What does it typically look like?
It usually appears as a tan patch, often around 3 cm x 4 cm in size, speckled with darker pigmented spots.