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This chapter reviews the prevalence, pathogenesis, and management of hair and scalp disorders but reports no new clinical findings.

This study observed that the biophysical properties of hair in Caucasian females with brown hair significantly change with age, and smoking or being overweight was linked to smaller hair cross-sectional areas.

This study found that men with vertex baldness had higher serum dihydrotestosterone levels compared to those with frontal baldness, suggesting different hormonal profiles between these two groups in androgenetic alopecia.

This study found that dietary supplementation with collagen, chondroitin sulfate, low-molecular weight hyaluronic acid, Pycnogenol®, and coenzyme Q10 significantly improved skin hydration, elasticity, nail hardness, and hair condition in patients with age-related dermatological changes after 12 weeks.

This study compared microneedling combined with platelet-rich plasma and microneedling with minoxidil for treating androgenetic alopecia in men, finding both approaches effectively improved hair density and alopecia grade.

This study found that individuals in this Egyptian cohort carrying the leucine (L) allele of the 5-α reductase type II enzyme had a higher risk of developing androgenetic alopecia, which may be associated with oxidative stress.

This study found that certain trichoscopic features, including hair diameter diversity patterns, helped differentiate female androgenetic alopecia from telogen effluvium in women, suggesting their potential use in clinical diagnosis.

This study found that low-dose oral minoxidil was more effective than topical minoxidil in increasing hair density and patient satisfaction among men with androgenetic alopecia, with fewer local side effects and better compliance reported over six months.

This study found a higher prevalence of lipid abnormalities in individuals with androgenetic alopecia, especially in severe cases, highlighting the need for early screening and treatment to prevent cardiovascular complications.

This study reviewed existing literature on Androgenetic Alopecia treatments, finding that minoxidil promotes hair growth but can cause side effects due to its traditional formulations. Novel delivery systems like film-forming sprays may reduce these side effects and enhance efficacy.

This study surveyed dermatologists in Greece and Italy and found significant variability and challenges in the diagnosis and treatment of alopecia areata, including limited use of severity scores and diverse treatment approaches, particularly for special site involvement and chronic cases.

This study found no significant associations between dermoscopic findings and the severity or stage of alopecia areata in children, though there was a notable correlation with nail findings.

In this study, Dheedhi Hair Care herbal shampoo significantly reduced hair fall and dandruff compared to a regular shampoo, with no reported side effects.

This review found that antimalarial agents were more effective than steroids for Lichen planopilaris, while finasteride and dutasteride showed favorable impacts on frontal fibrosing alopecia, despite heterogeneous study quality.

The study found that CK15 expression, representing hair follicle stem cell activity, was reduced or absent in scarred primary cicatricial alopecia lesions, suggesting stem cell damage may contribute to the scarring process.

This paper summarizes the main findings presented in the plenary sessions of the British Journal of Dermatology, July 2004 issue, and provides no new research results.

This review identified evidence gaps in NHIRD, emphasizing the lack of validated diagnostic criteria and the need for further research on ocular and systemic comorbidities associated with AA to enhance patient care and treatment strategies.

This study observed that bitemporal alopecia often coincides with conditions such as androgenetic alopecia, seborrheic dermatitis, and telogen effluvium. The researchers suggest bitemporal hair loss could help predict and monitor these associated hair diseases.

This review evaluated current evidence on minoxidil's potential to treat scars and reported reduced collagen accumulation and fibrosis in various studies, suggesting its antifibrotic effects may benefit wound healing; however, direct studies on acne scars are yet to be conducted.

This study demonstrated that a daily oral supplement of 1000 mg Kera-Diet® improved hair and nail conditions in women experiencing acute telogen effluvium and brittle nail syndrome over three months.

This study found that diphenylcyclopropenone (DPCP) was more effective and better tolerated than dinitrochlorobenzene (DNCB) in promoting hair regrowth in patients with alopecia areata.

This study reported that using platelet-rich plasma as an intraoperative holding solution significantly improved hair density and follicular growth in hair restoration surgery for androgenetic alopecia.

In this study, elevated serum levels of aldosterone and free testosterone, along with increased androgen and aldosterone receptor levels, were associated with early-onset androgenetic alopecia in female patients.

This research found that Foxc1 transcription factor and COL17A1 are critical in regulating quiescence and hair thinning in hair follicle stem cells, with aging-related DNA damage leading to hair loss.

This study found that psychoemotional stress disrupts hair growth in mice by terminating anagen and suggests a potential pathway for pharmacological management of stress-related hair loss in humans.

This study found that Cacumen platycladi extract significantly promoted hair growth and reduced dihydrotestosterone levels by inhibiting 5α-reductase activity in an androgen-sensitive mouse model.

This study concludes that phospholipid–polymer hybrid nanoparticles may be an effective delivery system for quercetin in treating androgenic alopecia by improving hair regrowth and preventing hair follicle cell apoptosis in rat models.

This study demonstrated that the biomimetic peptide PTP20 may help preserve hair pigmentation and reduce greying by enhancing melanocyte function and increasing melanin production in human hair follicles.

This study found that the prevalence of androgenetic alopecia was significantly higher among smokers compared to nonsmokers, though the severity wasn't linked to smoking intensity.

This study observed that white hair can create an optical illusion of increased scalp visibility, potentially misleading clinical evaluations of hair loss and complicating hair transplantation planning, and identified five core dyeing strategies to address this phenomenon.