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This narrative review explores the molecular mechanisms driving skin development and their role in skin diseases, emphasizing how disruptions in these pathways can lead to conditions like congenital disorders and cancers, potentially guiding new targeted therapies.

This study found that Lymphotoxin-beta primarily influences periderm differentiation, impacting epidermal and hair follicle differentiation at later stages.

This review highlights the significant role of next-generation sequencing in uncovering the genetic basis of hair disorders, identifying 28 nonsyndromic conditions linked to specific genes.

This case report describes a 4-year-old boy with congenital alopecia characterized by complete irreversible hair loss and papular lesions associated with keratin-filled cysts.

This study found that individuals with heterozygous truncation-type variants in the *DSP* gene exhibit lower skin temperature and higher transepidermal water loss, with specific microscopic skin changes and pseudomonilethrix.

Metabolic disorders can cause hair structure defects and growth issues, but amino acid levels in hair remain normal.

This study identified the transcription factor Elf5 as a novel regulator of keratinocyte proliferation and differentiation in skin, with expression elevated in stem/progenitor cell populations, suggesting its potential role in determining cell fate during skin and hair development.

This case report describes a rare instance of Olmsted syndrome with hypotrichosis in a 5-year-old boy, noting mild improvement in symptoms following treatment with oral acitretin and other interventions.

This review discusses recent evidence on the Notch signaling pathway's role in regulating hair follicle development and stem cell differentiation, but provides no new research findings.

This study found that administering an adenovirus vector to increase Sonic hedgehog gene expression in mouse skin accelerated the transition of hair follicles into the growth phase, promoting hair growth.

This study found significant variation in tissue mutant load in individuals with the T8993G mutation, which complicates genetic counseling and may inform genotype-phenotype correlations, especially using hair bulb mtDNA analysis.

This study found that impaired TCF/Lef1 signaling in mice leads to significant skin barrier defects due to altered lipid metabolism and epidermal differentiation.

In this study, gene inactivation in mouse hair follicle stem cells lacking ILK impaired wound healing by reducing their progeny’s contribution to the regenerating epidermis, but did not affect hair follicle regeneration.

This review discusses the human Nude/SCID phenotype and FOXN1 gene's role in immunological disorders affecting T-cell development but reports no new clinical findings.

Red and infrared light therapy improves hair growth in balding patients.

A 73-year-old man's grey-white hair turned dark brown after eczema treatment.

Lactic acid cream can help improve skin bumps known as eruptive vellus hair cysts.

Understanding skin structure and development helps diagnose and treat skin disorders.

This review summarizes fundamental concepts and recent advancements in hair follicle biology, including insights from mouse models into broader molecular and cellular processes relevant to regeneration and development.

This article discusses congenital atrichia and presents no new clinical findings.

This article reviews non‐surgical treatments and surgical techniques for male‐pattern hair loss and does not present new findings.

This review discusses the various triggers and diagnostic challenges in determining the cause of telogen effluvium-related hair loss, without providing new clinical results.

This study found that the R257X mutation in the AIRE gene is prevalent among Russian patients with autoimmune polyglandular syndrome type 1, particularly in those with hypoparathyroidism and chronic mucocutaneous candidiasis.

This article reviews major types of genetic hair shaft defects and associated syndromes, emphasizing understanding histologic features and diagnostic methods, but reports no new clinical findings.

This article reviews fetal scalp hair formation and related disorders but reports no new research results.

This review explains how recent understanding of Wnt signaling regulation in hair follicles could potentially be used to enhance hair growth, but it reports no new empirical results.

This article illustrates various hair shaft defects and suggests that dermatologists can diagnose most of them using light microscopy and polarization without needing advanced imaging techniques.

This article discusses loose anagen syndrome, highlighting its characteristics, diagnostic methods, and spontaneous improvement over time, but provides no new clinical results.

This article reviews hair and nail disorders in children, emphasizing their prevalence, congenital and acquired origins, and the diagnostic challenges compared to treatment, but reports no new clinical results.

This paper reviews the role of ATP-dependent chromatin remodeling complexes in epidermal homeostasis, hair regeneration, and skin repair, noting contributions to 3D-genomic organization and suppression of UV-induced hyper-proliferation, without presenting new results.