Familial isolated café-au-lait macules

Familial isolated café-au-lait macules (also known as familial café-au-lait spots or familial multiple café-au-lait macules) is a rare inherited skin condition characterized by the presence of multiple café-au-lait macules (CALMs) — flat, well-circumscribed, uniformly hyperpigmented patches on the skin that range in color from light brown to dark brown. These spots appear without any of the other clinical features typically associated with neurofibromatosis type 1 (NF1) or other syndromes in which café-au-lait macules commonly occur, such as Legius syndrome, McCune-Albright syndrome, or Noonan syndrome. The condition primarily affects the skin (integumentary system) and is considered benign. Affected individuals typically present with six or more café-au-lait macules that may be present at birth or develop during early childhood. The macules can vary in size and may appear anywhere on the body. Importantly, individuals with this condition do not develop neurofibromas, Lisch nodules, optic pathway gliomas, skeletal abnormalities, or other complications associated with NF1 or related RASopathies. Some cases have been linked to heterozygous pathogenic variants in the NF1 gene or the SPRED1 gene, but in familial isolated CALMs, the phenotype remains limited to the skin pigmentation abnormality. No specific treatment is required for this condition, as it does not pose health risks beyond the cosmetic appearance of the spots. Dermatological evaluation and genetic counseling are recommended to distinguish this benign condition from NF1 and other syndromes. Laser therapy may be considered for cosmetic purposes, though results can be variable and recurrence of pigmentation is possible. Long-term follow-up may be advised, particularly in childhood, to ensure that no additional features of NF1 or other conditions develop over time.

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