Does naegeli–franceschetti–jadassohn syndrome cause hyperpigmentation?

Yes. Naegeli-Franceschetti-Jadassohn syndrome is a cause of hyperpigmentation.

Hyperpigmentation darkening of an area of skin or nails caused by increased melanin wikipedia.

Naegeli-Franceschetti-Jadassohn syndrome Naegeli-Franceschetti-Jadassohn syndrome Naegeli–Franceschetti–Jadassohn syndrome, a rare autosomal dominant form of ectodermal dysplasia, characterized by reticular skin pigmentation, diminished function of the sweat glands wikipedia.

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