Reticulate acropigmentation of Kitamura (RAK) predominantly affects East Asian populations, though isolated cases and familial occurrences have been reported globally. Japanese researchers Kitamura et al. first described this condition in 1943. In 2013, pathogenic variants in ADAM10 (a disintegrin and metalloprotease 10) were identified as causative in multiple Japanese RAK pedigrees. The occurrence of RAK with Dowling-Degos disease (DDD) is relatively well-documented. However, rare associations with bilateral clinodactyly, nevus of Ito, dermatopathia pigmentosa reticularis, and progressive seborrheic keratosis have also been reported. RAK is an extremely rare autosomal dominant disorder. Café-au-lait macules (CALMs) represent common hyperpigmented lesions, yet no documented cases of RAK-CALMs coexistence exist in the literature to date.

Facial hair is an important social and psychologic aspect of clinical appearance for men. The purpose of this review is to provide a comprehensive overview of the causes of alopecia of the beard including the prevalence, pathophysiology, clinical presentation, and treatment. In this review, we highlight more common causes of beard alopecia including alopecia areata and pseudofolliculitis barbae, infectious causes such as tinea barbae and herpes simplex folliculitis, and rare causes including dermatopathia pigmentosa reticularis and frontal fibrosing alopecia. This review serves as an important resource for clinicians when faced with patients suffering from beard alopecia.

Reticulate pigmentary disorders (RPDs) are a group of inherited and acquired skin conditions characterized by hyperpigmented and/or hypopigmented macules. Inherited RPDs include dyschromatosis symmetrica hereditaria (DSH), dyschromatosis universalis hereditaria (DUH), reticulate acropigmentation of Kitamura (RAK), Dowling-Degos disease (DDD), dyskeratosis congenita (DKC), Naegeli-Franceschetti-Jadassohn syndrome (NFJS), dermatopathia pigmentosa reticularis (DPR), and X-linked reticulate pigmentary disorder. Although reticulate pattern of pigmentation is a common characteristic of this spectrum of disorders, the distribution of pigmentation varies among these disorders, and there may be clinical manifestations beyond pigmentation. DSH, DUH, and RAK are mostly reported in East Asian ethnicities. DDD is more common in Caucasians, although it is also reported in Asian countries. Other RPDs show no racial predilection. This article reviews the clinical, histological, and genetic variations of inherited RPDs.

Dermatopathia pigmentosa reticularis is a rare ectodermal dysplasia with mottled pigmentation. Here we report a case of 15-year-old boy with variable (reticulate as well as diffuse) pigmentary disorder and adermatoglyphia.