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This report presents four cases highlighting diagnostic challenges between specific types of alopecia, comparing their clinical and histopathologic features without providing new research findings.

The book discussed in this abstract is a comprehensive guide to hair analysis, detailing the latest methods and applications across various fields such as toxicology and drug monitoring, designed for both newcomers and experts in the field.

This article discusses how the brain's neural circuits evaluate skin aging to judge social standing and suggests that people often attempt to deceive themselves and others about their true age.

This article reviews the historical and scientific perspectives on the phenomenon of stress-induced changes in hair color and reports no evidence supporting the idea that holding or resigning from political office accelerates human aging or hair graying.

This article discusses observations about the relationship between baldness and gray hair in middle-aged men, noting that baldness often precedes grayness, and suggests a possible connection to premature aging, but reports no new data.

In this study, the researchers found that measuring tacrolimus levels in scalp hair could be a reliable method for monitoring drug exposure in kidney transplant recipients, offering an alternative to frequent blood tests by utilizing self-collected hair samples.

This article presents an overview of uncombable hair syndrome, emphasizing its clinical and molecular characteristics and noting systemic manifestations such as neuropsychiatric, ophthalmic, and cardiopulmonary issues.

This review discusses the application of low-level light therapy for hair loss treatment, particularly androgenetic alopecia, and reports no new clinical results; the authors suggest consideration of light source characteristics and potential pros and cons.

This review discusses various treatments for androgenic alopecia, highlighting FDA-approved options and other commonly used therapies, but reports no new clinical results.

This study found that bleaching significantly damages hair structure and increases combing difficulty, while dyeing with emulsifiers can partially reduce damage and improve combability, yet both processes cause notable protein loss.

This study reports that variable environmental factors, including dietary habits, may contribute to the increasing incidence and diverse clinical presentations of frontal fibrosing alopecia.

Drug addicts often have scars, skin color changes, blocked veins, and bruising, with severe ulcers from barbiturate injections.

Artificially inducing hair regrowth in mice can change the normal pattern and timing of hair growth, with minimal color differences between old and new fur.

This study found that laser-based goniophotometry can effectively monitor changes in hair surface reflection related to color and cuticle cell tilt across different ethnic origins.

This study found that hair testosterone concentrations show some consistency over time, but factors like hair washing and individual growth rates influence these levels, suggesting the need for careful sampling and analysis adjustments.

This study found that Camellia sinensis (tea) extracts may protect hair from UV-induced damage and color change, with efficacy linked to higher concentrations of key compounds like catechins.

In this case report, an 86-year-old man experienced new hair growth and color change in alopecia areata after receiving fecal microbiota transplantation for noninfectious diarrhea.

This study found that applying 0.005% latanoprost topically to eyelashes significantly increased their length and darkened their color in healthy volunteers over three months, without causing any side effects or changes in intraocular pressure compared to a placebo.

This study tested a natural hair dye made from papaya seed extract, celery leaf, and avocado, finding color change in animal hair but also noting tissue changes like hyperkeratosis.

This study reported that stress can induce hair graying in mice through noradrenaline-mediated depletion of melanocyte stem cells in hair follicles, providing a mechanism that connects stress to hair color changes.

In this study, feeding H-line chickens a diet with 1.0% tyrosine for 40 days significantly increased melanin deposition in feathers and revealed changes in gene expression related to melanin pathways, suggesting tyrosine's involvement in regulating feather color through the EDNRB2 regulatory network.

This study found that injecting various hormones or hormone-cholesterol mixtures into Willow Ptarmigan and White-tailed Ptarmigan led to the growth of pigmented feathers instead of the usual white winter feathers, suggesting hormonal influence on plumage color changes.

This case report describes a patient with chronic renal failure on hemodialysis who experienced hair depigmentation while taking heptaminol, with the condition reversing after discontinuing the medication; the exact mechanism causing the color change is still unclear.

Testosterone in older women can increase bone density, muscle mass, fat mass, improve memory, and boost libido, but may cause nipple color changes.

This review discusses various adverse drug reactions affecting hair, such as hair loss, hypertrichosis, and color changes, and emphasizes their generally reversible nature if the causative drug is discontinued.

This study developed and tested a new algorithm for analyzing coat and skin coloration in laboratory animals, using digital images and hierarchical color clustering, which effectively quantified color proportions and tracked changes over time without specialized software.

This study employed a laser-based method to analyze how light reflection patterns vary on human hair fibers, revealing changes related to hair color and the tilt of the cuticle cells.

In this report, a 77-year-old woman treated for essential thrombocytosis with low-dose hydroxyurea experienced an unexpected change in hair color from gray to dark brown after 20 weeks, highlighting a potential aesthetic side effect of the drug, in addition to therapeutic effects.

This article reviews drug-induced hair changes, highlighting that while many drugs are occasionally linked to hair loss, this connection has been conclusively established for only a few, and such hair loss is typically reversible.

This article discusses strategies for changing hair color by regulating target genes in hair follicles using advanced delivery systems, but it reports no new experimental findings.