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This article discusses the structure of hair follicles and their significance in evaluating hair disorders, but it does not report any new research findings.

This study found that trichoscopy criteria can distinguish female androgenic alopecia from chronic telogen effluvium, with specific features achieving 98% diagnostic specificity.

Diffuse alopecia in women may be related to androgens and iron deficiency, and basic hormone and nutrient screening is useful.

This retrospective study concluded that PUVA treatment is generally ineffective for alopecia areata, with low effective success rates for partialis, totalis, and universalis types.

This review discusses the effects of hormonal changes on hair follicles, concluding that hormones like androgens and estradiol significantly influence hair growth and cycle, while the roles of other hormones are still being researched.

This study found that as hair loss severity increased in women with female pattern hair loss, the number of vellus follicles also rose, indicating miniaturization of terminal hair follicles.

The human hair follicle can store topical compounds and be targeted for drug delivery with minimal side effects.

This study observed that particles sized 300-600 nm penetrate hair follicles more efficiently, likely due to alignment with the thickness of the human hair cuticula.

In this study, low-level laser therapy showed no statistically significant improvements in hair growth measures, despite some patients experiencing increases in terminal hairs and shaft diameter.

In this study, specific versican expression was observed in the anagen phase of human hair follicles, suggesting its importance in maintaining normal hair growth.

This study supports the idea that steatocystoma multiplex is a hamartomatous condition and suggests it may be a variant of eruptive vellus hair cyst, both originating in the pilosebaceous duct.

In this study, latanoprost significantly increased hair density in young men with mild androgenetic alopecia after 24 weeks, suggesting it may stimulate hair follicle activity and treat hair loss.

This study observed that Japanese women experience diffuse central hair loss after age 40, characterized by reduced hair density and thicker hair ratio rather than vellus-like hairs.

This review explores how androgens and growth hormone influence the development of terminal hairs and sebaceous glands, attributing variability in hirsutism and acne to differing genetic sensitivities to androgens, but reports no new experimental data.

This study reports that permanent and severe alopecia is a newly identified complication of the FEC 100–docetaxel regimen used for adjuvant breast cancer treatment.

Hormones and genetics affect hair growth and patterns, with some changes reversible and others not.

This study reports that a hair shedding threshold of 100 hairs or more may provide the best concordance with clinical diagnosis for distinguishing chronic telogen effluvium from androgenetic alopecia.

This study found that platelet-rich plasma was not effective in treating androgenetic alopecia in men with grade 4–6 hair loss.

This article reviews current knowledge on the causes, diagnosis, and medical treatments for androgenetic alopecia, particularly in men, and reports no new findings.

This study found that permanent alopecia can occur after certain chemotherapy treatments and presents as nonscarring hair loss similar to androgenetic alopecia, with specific histological features that could be misdiagnosed without proper clinicopathological correlation.

This article reviews common hair growth abnormalities in children, emphasizing the importance of distinguishing normal development from potential signs of metabolic disorders and indicates no new clinical results.

This study demonstrated that hair follicle-derived cells can induce hair follicle formation in an in vitro skin organ culture system using human retroauricular skin specimens.

This study found that the hHa7 gene in hair follicle trichocytes is the first identified to have its expression directly regulated by androgens, suggesting it as a marker for androgen action on hair follicles.

DS cells in hair follicles can help form and restore hair, especially in hair loss conditions.

This abstract provides no results; it is a website notification about cookies and general access to JAMA content.

This study examined the sensory innervation of hair follicles in the furry skin of rat hindlimbs, finding significant differences among hair types in their innervation patterns and densities.

In this study, researchers observed that follicular microinflammation significantly contributes to the early stages of male androgenetic alopecia, potentially leading to perifollicular fibrosis and follicle destruction as the condition progresses.

This study found decreased hair density and altered follicular architecture in the balding frontal scalp of patients with androgenic alopecia, with increased vellus hairs noted.

In this randomized, double-blind, placebo-controlled study, daily use of the Nutrafol® Women's Capsules nutraceutical significantly increased the number of terminal and vellus hairs and improved hair quality in women with self-perceived thinning over six months, without any reported adverse events.

This study suggests that an increase in kenogen phases, along with rising vellus hair cycles and fewer normal hair cycles, is associated with the progression of female androgenetic alopecia.