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Merkel cells are abundant in facial vellus hair follicles, especially during the anagen phase.

This Phase II trial found that topical GT20029 significantly increased hair count and width at 12 weeks in Chinese men with androgenetic alopecia compared to placebo, with good tolerability and similar adverse event incidence across groups.

In this multicenter Phase II trial, researchers found that topical GT20029 significantly increased hair regrowth in Chinese adult males with androgenetic alopecia compared to placebo, demonstrating good tolerability and suggesting the need for further studies to confirm its therapeutic potential.

This study found that intradermal administration of QR678 Neo® significantly reduced hair fall and improved hair growth in patients with androgenetic alopecia and female pattern hair loss, with no side effects reported during long-term follow-up.

Among men with androgenetic alopecia, this study found that taking 5 mg of KX-826 twice daily significantly increased hair count compared to a placebo, with the treatment being well-tolerated and no serious adverse effects reported.

In this study, the researchers found that the topical generic 5% new minoxidil foam is as effective and safe as the 5% Rogaine® foam in increasing hair density and diameter in men with androgenetic alopecia over 24 weeks.

The authors concluded that chronic telogen effluvium in middle-aged women presents distinct clinical and histological features that differ from androgenetic alopecia and acute telogen effluvium.

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

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 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 observed various patterns of permanent alopecia in breast cancer patients treated with taxanes and adjuvant hormonal chemotherapy, hypothesizing disruptions in hair follicle cycles due to chemoinflammatory and hormonal factors.

This article reviews common causes of hair loss, noting that a well-directed history and examination are often sufficient for diagnosis, and reports no new clinical findings.

In this study, scalp biopsies from HJMD patients revealed histological similarities to chronic telogen effluvium and highlighted the role of CDH3 mutations disrupting normal hair cycles.

This article discusses potential roles for retinoids in hair regrowth and proposes future studies, reporting no new experimental results.

This chapter reviews the anatomy and physiology of hair follicles but reports no new research findings or clinical results.

This study reports that scalp biopsies in white adults usually have 16.5 hair follicles, primarily in the anagen phase, with male samples showing fewer follicular units but more fibrous tracts in certain areas.

This study observed variability in hair density and types across different scalp areas in cadaver biopsies, providing reference values that could aid in diagnosing hair disorders in Asians.

This study found that while both cetirizine 1% and minoxidil 5% increased hair density in men with androgenetic alopecia, minoxidil showed a significantly higher improvement, and both treatments lost effectiveness after 8 weeks without use; cetirizine was well-tolerated with no significant adverse reactions.

The document concludes that hair biology is complex and there are still unanswered questions about hair loss and follicle changes.

Latanoprost eye drops caused excessive hair growth and eyelash whitening in a woman.

This study found that Thai males with androgenic alopecia displayed lower average hair density in the occipital scalp compared to other Asian populations, but higher than those with advanced AGA.

This study reported that microneedle-assisted delivery of PEGylated recombinant human fusion collagen significantly improved hair regrowth and density in an androgenetic alopecia mouse model and in a small clinical trial with AGA patients, suggesting potential efficacy and safety for this treatment approach.

This study found that a proprietary saw palmetto extract significantly improved hair growth in men and women with self-perceived thinning hair over a 6-month period, outperforming placebo on key hair growth parameters without any treatment-related adverse events.

In this study, 14 sessions of 675 nm laser stimulation significantly improved hair count, density, and thickness in Indian patients with androgenetic alopecia, with an increase of around 17% in hair parameters over four months.

This review outlines the functional anatomy, pathology, and molecular mechanisms of androgenetic alopecia, emphasizing the need for multi-omics approaches to better understand this condition's biology.

This study found that electronically-operated pneumatic injections for administering a peptide-hyaluronic acid combination were well tolerated and led to significant improvement in hair density and thickness for men with androgenic alopecia over six months, though the exact mechanism remains uncertain.

This study found that a 12-week topical treatment with a caffeine and Procapil 3% formulation effectively reduced hair loss by 26.9% and improved hair growth in men with androgenetic alopecia, without any reported adverse effects.

This case report describes a 22-month-old with alopecia universalis who showed improved hair growth after receiving combination therapy with minoxidil, corticosteroids, and excimer laser.

This case study reported that prolonged use of the cancer drug Erlotinib in a postmenopausal woman was associated with trichomegaly and hypertrichosis, highlighting the importance of considering medication history in such cases.