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This review highlights that natural hair dyes from plant-derived pigments can produce viable colors on gray hair with low irritation potential, though they face challenges in shade range and consistency; some products may also be adulterated, affecting safety perceptions.

This review summarizes current research on natural hair dyes, reporting that plant-based formulations can safely provide viable colors on gray hair with minimal irritation compared to synthetic options but face challenges in color range and consistency.

In this systematic review, the authors found that hair loss in women causes significant psychological distress, with supportive interventions like cognitive behavioral therapy and cosmetic solutions helping to reduce anxiety, improve coping, and enhance quality of life.

This case report describes a rare presentation of recurrent plaque psoriasis on the penile shaft, which was controlled with systemic therapy after topical treatments failed.

This case report describes a 59-year-old woman with a rare trichoepithelioma on her eyelid, emphasizing the importance for optometrists to differentiate it from basal cell carcinoma.

This study suggests that fibroblast growth factors FGF-4, FGF-8, and FGF-9 may play redundant roles as signals in epithelial-mesenchymal interactions during multiple stages of tooth development in mice.

In this study, researchers identified 18 genetic associations with scalp and facial hair traits in Latin Americans, including novel loci for hair greying and balding, with implications for understanding hair evolution.

This study describes the development of the BASP classification system, providing a universal and systematic approach for classifying pattern hair loss in both men and women.

This review discusses the roles of metabolism, reactive oxygen species, intracellular pH, and cell morphology in influencing cell fate decisions during stem cell differentiation but reports no new experimental results.

This article examines differences in aging among ethnic populations and highlights cosmetic procedures specific to skin of color, but reports no new research findings.

This study found that trichoscopy can rapidly and noninvasively diagnose tinea capitis and alopecia areata in pediatric patients by identifying specific hair patterns associated with each condition.

This study classified hairline contours in Asian women and concluded that their refined hair transplantation techniques may help correct wide foreheads with M-shaped or rectangular hairline contours.

In this study, researchers used three-dimensional reconstruction to show that the shape of the hair follicle determines the hair's form, with variations observed among different racial groups.

This review discusses the historical understanding and evolving diagnostic criteria for polycystic ovary syndrome without presenting new clinical findings, highlighting the multifactorial nature and associated risks of the condition.

African hair is more fragile due to its unique shape and internal structure.

This review discusses the various designs of follicular unit excision punches used in hair transplantation without reporting new clinical results; it emphasizes the importance of understanding each punch's benefits and limitations.

This study observed that individuals with mixed ethnicity had hair that varied widely in shape and showed significant surface damage near the root, differing from monoracial hair characteristics.

This review discusses the limitations of current hair classification systems and highlights the need for standardized reporting of key hair characteristics to improve study comparisons; it reports no new results.

In this study, researchers observed the patterns of hair distribution and scalp anatomy in Chinese young adult males, finding significant variations in hairline shape, hair density, and follicular unit structure.

This article reviews various hair transplant techniques and procedures across different ethnic groups but does not provide new clinical results, highlighting the need for tailored approaches in diverse populations.

This study introduces a method for determining the orientation of collagen fibers in skin by analyzing the anisotropic shape of hair pores, which may aid in skin grafting procedures.

This article discusses challenges and limitations of using simple tissue mechanics for repairing head and neck skin defects in trauma and does not report new findings; it highlights potential problems with routine methods.

This review discusses guidelines for hair transplantation tailored to East Asian patients, focusing on hairline design, donor harvesting, and graft techniques, and reports no new clinical results.

This study found that scanning electron microscopy can identify four specific hair morphology patterns in alopecia areata patients, offering a less invasive diagnostic option compared to punch biopsy.

This study found trichoscopy to be a highly sensitive, non-invasive method for diagnosing tinea capitis in children, which could be valuable in resource-limited settings lacking mycological culture facilities.

This study examined how different surgical techniques tailored to individual patient characteristics affected outcomes in secondary female hairline correction surgery, finding that patient-specific approaches can lead to satisfactory results.

This review discusses the adverse effects on hair associated with targeted cancer therapies and reports no new clinical results; it emphasizes the need for comprehensive documentation of these effects.

In this case report, an adolescent girl with itchy alopecic patches showed hair regrowth and no new alopecia patches after 6 weeks of treatment, despite initial minimal improvement with oral doxycycline.

This study surveyed hairline preferences and found that the M-shaped contour was most preferred overall, with lower forehead heights favored by men and those without a history of hair transplantation.

This review proposes an anatomy-based framework for understanding recipient site scalp necrosis in hair transplantation, emphasizing regional vascular vulnerability and surgical factors, but does not provide new clinical results.