Linear and whorled nevoid hypermelanosis

What it is

A rare hyperpigmentation of the skin disease characterized by the congenital to infantile-onset of bilateral, diffuse (occasionally localized), reticulate (swirls and streaks), macular hyperpigmentation following the lines of Blaschko, typically involving the trunk, limbs, head and neck (but sparing palms, soles and mucosa), without preceding inflammation, blistering or atrophy. Occasionally, extracutaneous abnormalities, including autism, seizures, cardiac defects, skeletal abnormalities and developmental delay, may be associated. Histologically, basal and/or suprabasal melanosis, without pigment incontinence, is observed.

Key facts

Prevalence

<1 / 1 000 000

Age of onset

Infancy, Neonatal

Classified as

Disease

Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.

ICD-10 codes

ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.

Related health topics

Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.

Cross-references