NEVUS SPILUS

By Gary M. White, MD

Nevus spilus


The nevus spilus (NS) is a cafe-au-lait macule with multiple darker pigmented macules scattered within.

Clinical

The term nevus spilus refers to a pigmented patch that has a light background and multiple, darker pigmented papules or macules within. Larger lesions have been called speckled lentiginous nevus.

Vitiligo

Very rarely, vitiligo has been reported in a “halo” configuration in the surrounding normal skin and as trichrome vitiligo “within” the congenital segmental speckled lentiginous nevus on face in a 9-year-old girl [Indian J Dermatol Venereol Leprol 2017;83:612-4].

Malignant Change

The development of a melanoma within a nevus spilus is a rare event. One review of 25 cases found a mean age of 49 years at melanoma diagnosis. Only 12% (3/25) of the NS were < 4 cm. The following criteria associated with increased risk of developing melanoma [Ann Dermatol Venereol 2006;133:323-8]:

Referenced here [JAAD June 2011 Volume 64, Issue 6, Pages 1190–1193] is a report of melanoma arising within large segmental lentiginous nevi. Four women (mean age, 48 years; range, 38-52 years) with 7 primary melanomas (1-3 per patient). Two patients (cases 2 and 3) reported overall darkening and proliferation of pigmented lesions within the SLN in response to sun exposure. Melanomas arose only on sun-exposed SLN sites.

Treatment

No treatment is usually needed. If small enough, surgical excision may be done. The patient should monitor for any change and seek help if such occurs. Any significant change in pigmentation should prompt a biopsy.

Additional Pictures

Nevus spilus Nevus spilus Nevus spilus Nevus spilus

Giant Speckled Lentiginous Nevus (courtesy Michael O. Murphy, MD)
Giant Speckled Lentiginous Nevus

Is there background pigment? If yes, then it is a nevus spilus. If not, and the macules are lentigines, then the lesion is agminated lentiginosis. If nevi, then agminated nevi.
Nevus spilus

A tiny nevus spilus.
Nevus spilus

A nevus spilus and a cafe au lait spot.
A nevus spilus and a cafe au lait spot

A nevus growing within a nevus spilus.
nevus spilus

References

This article reviews melanomas developing in nevus spill and has a good color photograph of one. REVISTA DERMATOLOGIA ARGENTINA 2015;21;174

This article presents several women in whom melanoma developed in large, speckled, lentiginous nevi. JAAD June 2011 Volume 64, Issue 6, Pages 1190–1193

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