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This study developed new label-free imaging methods to analyze human hair, identifying distinct chemical environments within cuticle layers and changes in hair structure caused by depilatories, while showing that the treatments tested did not significantly affect skin cell differentiation or proliferation.

This study observed that bacterial communities on scalp hair collected through non-invasive swabbing showed similar diversity and composition to those obtained by cutting or removing hair, suggesting that swabbing is an effective method for microbiome analysis on hair.

In this study, particles similar in size to keratin cells were surprisingly found to penetrate more efficiently into hair follicles due to a possible pumping effect from moving hairs.

In this study, researchers observed that bacterial community structures on human scalp hair are unique to individuals and show consistent patterns across different sampling sites on the scalp, without significant variation between these sites.

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.

Dark skin has stronger barriers and structure due to specific gene activity.

This study found that androgen receptor inactivation in male and female mice reduced susceptibility to DMBA-induced skin cancer, but the effect varied by the carcinogenesis model.

In this study, researchers found that the glabrous skin of the rat forelimb contains sparse Meissner corpuscles and Merkel complexes, with more slowly adapting afferents in the palm and rapidly adapting afferents in the digit extremity.

This study found that patients with androgenetic alopecia showed distinct scalp bacterial imbalances compared to healthy individuals, which were associated with unhealthy lifestyles. These microbial changes might contribute to follicular inflammation, potentially accelerating hair loss in these patients.

This review discusses the unique characteristics and disorders of Asian hair, emphasizing the need for more comprehensive studies in this area.

This study found that while the macular, retinal nerve fiber layer, and retinal layers' thickness were similar between alopecia areata patients and controls, the choroidal thickness was significantly thicker in the alopecia areata group, suggesting potential inflammation-related changes.

This study found that alkyl shikimates with different alkyl group structures can increase or decrease fibroblast proliferation depending on concentration and alkyl chain length, with some variants showing cytotoxic effects due to their hydrophobicity and cell membrane permeability.

In this review, researchers examined the molecular diversity and expression patterns of major skin appendage proteins, like keratins and EDC proteins, in tetrapods, highlighting recent findings in reptiles and birds and identifying knowledge gaps for future research.

This review discusses the structural differences between black and white skin, noting that black skin has more compact stratum corneum, larger melanosomes, and increased transepidermal water loss.

This article examines microscopic structural differences and pigment distribution in various rabbit hair colors and reports no clinical results.

This study found significant structural and compositional differences in hair affected by alopecia areata compared to healthy hair, using a range of physico-chemical investigation methods.

This review explores the structural and functional sex differences in mammals beyond reproductive organs, highlighting variations in life expectancy, organ size, metabolism, and immune function, but it reports no new results.

This narrative review highlights the distinct needs of pediatric hair care, emphasizing gentler formulations due to differences in children's hair physiology, structure, and barrier function, and calls for targeted regulations and research due to limited safety evidence.

This study found no significant histologic differences in skin structure based on age, sex, or woodchuck hepatitis virus infection status among woodchucks.

This study found that male and female hair specimens show structural differences, with female hair having a brown color at the distal end and smooth surface texture, while male hair is completely black and shows surface irregularities; these differences may aid forensic analysis.

This study found that micro-computed tomography (micro-CT) was highly effective for analyzing the cross-sectional geometry of hair fibres, including the medulla in highly curled hair, but less effective than scanning electron microscopy for surface details.

This review examines dandruff and seborrheic dermatitis, highlighting the role of Malassezia yeasts in inflammation and hyper-proliferation, and reports no new clinical findings.

This review discusses the heterogeneity of dermal fibroblasts in healthy mouse and human skin and reports no clinical results; the authors highlight potential insights into physiological and pathological wound healing.

In this study, researchers found that follicular and epidermal transglutaminases are biochemically and immunologically distinct, suggesting the possibility of selectively modifying hair or epidermal proteins.

In this study, using sterile gloves during hair restoration surgery did not reduce scalp contamination compared to clean gloves due to the natural microbiome of the scalp.

This review examines the chemical composition and potential health risks of hair straighteners, but it reports no new findings and emphasizes the importance of understanding hair fibre structure for safe use.

This study reviews the biology and cosmetic treatment of hair, emphasizing future advancements in safer, more effective procedures to meet consumer needs for hair care.

This study observed that hairless rat skin was more permeable to mannitol and progesterone than hairy rat skin, indicating that follicular structures significantly impact percutaneous absorption.

This study analyzed gray hair, revealing that it differs from pigmented hair in follicular activity, oxidative balance, and structure, impacting coloring processes and necessitating adapted techniques to maintain hair quality.

This research analyzed two ancient mammoth hair strands and reported distinct structural and elemental differences, including calcium, iron, and copper deposits, which vary with age and origin.