X-linked reticulate pigmentary disorder
X-linked reticulate pigmentary disorder is a rare X-linked genetic condition in which males manifest multiple systemic symptoms and a reticulated mottled brown pigmentation of the skin, which, on biopsy, demonstrated dermal deposits of amyloid. Females usually only have linear streaks of hyperpigmentation.
Source: Wikipedia — X-linked reticulate pigmentary disorder (CC BY-SA 4.0)