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This review suggests that hyperspectral and terahertz imaging show promise in non-invasively assessing scalp changes associated with hair loss, but further validation is needed for clinical application.

This study highlights the potential of novel non-invasive testing techniques to enhance the diagnosis, treatment, and care of scalp hair diseases, urging future research to improve their accuracy and efficiency.

This study used non-invasive imaging techniques to assess hair follicle characteristics in AGA mice, revealing delayed hair shaft alternation and growth stages, as well as testosterone-induced follicle miniaturization, offering potential methods for evaluating AGA on human scalps in vivo.

This review discusses hydrogel-forming microneedles for non-invasive drug delivery in dermatology and reports no new clinical results, emphasizing their promise in improving treatment adherence and patient comfort.

This research identified unique gut microbiota patterns in alopecia areata patients, with potential as diagnostic biomarkers and suggesting avenues for microbiota-focused therapies.

This study reports improved methods for harvesting and processing keratinocytes from plucked human hair, enhancing their utility in generating donor-specific induced pluripotent stem cells more efficiently and reliably.

This article critically assesses literature favoring horizontal over vertical sections for diagnosing scalp diseases and concludes that a qualitative, vertical approach improves diagnostic precision for alopecias.

This review discusses the advantages and limitations of various hair loss evaluation methods but reports no new results; it emphasizes the importance of cautious interpretation for these diagnostic tools.

This study found a significant positive correlation between hair thickness and growth rate, with a notably slower growth rate observed in men with male pattern hair loss compared to healthy controls.

This study identified specific reflectance confocal microscopy features that help differentiate scarring from non-scarring alopecia, providing a non-invasive diagnostic tool.

This study reported that active smokers, including e-cigarette and hookah users, had worse skin quality with more wrinkles and pigmentation compared to ex-smokers and non-smokers, suggesting smoking negatively impacts skin health and may motivate cessation efforts.

This study found that patients with frontal fibrosing alopecia showed significant alterations in protein expression in forehead corneocytes, suggesting the condition may have systemic implications beyond the scalp.

Combining radiofrequency and ultrasound significantly boosts skin's natural hyaluronic acid production.

This study observed that hair cortisol concentrations in primates are influenced by factors such as age, sex, hair growth rates, and sampling methods, which must be accounted for in research designs.

This review evaluates various biopsy protocols for alopecia diagnosis and discusses the authors' experience with the St John's protocol but presents no new clinical findings.

This study suggests that infrared thermography may be a useful noninvasive tool for diagnosing active phases of frontal fibrosing alopecia when combined with dermoscopy.

This review discusses the potential of using human hair proteomics for non-invasive diagnostic and forensic applications but reports no new results; the authors highlight areas needing further research.

This article provides an overview of how dermoscopy can aid in the noninvasive diagnosis of various general dermatological disorders, grouped by clinical presentation, but reports no new clinical results.

In this study, researchers developed a simple, non-invasive method to monitor circadian gene expression using whole hair root cultures, finding that elderly dementia patients' peripheral clocks still oscillate similarly to younger, healthier individuals, which suggests cellular senescence minimally affects some aspects of circadian rhythms.

This review highlights evidence supporting the potential of blue light therapy as a non-invasive treatment for managing skin and hair conditions by modulating interactions between the skin microbiome and its host.

In this study conducted from September to November 2023, researchers used trichoscopy to accurately diagnose cicatricial alopecias by revealing unique patterns, reducing the need for biopsies, and proving to be a valuable non-invasive diagnostic method.

This article reviews various diagnostic tools for hair disorders, describing methods ranging from invasive to noninvasive, but reports no new research findings or clinical results.

This study reports that using machine learning models, particularly XGBoost and Random Forest, can accurately predict PCOS phenotypes based on non-invasive data, with cycle length as the most significant predictor.

This article describes various hair and scalp examination techniques, including noninvasive, semi-invasive, and invasive methods, noting that trichoscopy is a simple, well-accepted, noninvasive technique for evaluating hair loss patients and monitoring treatment.

This review examines the molecular mechanisms of the circadian clock and its effects on cardiovascular functions, proposing a novel non-invasive method using hair follicle cells to assess circadian regulation in humans, but reports no new clinical results.

In this study, women with PCOS exhibited a significantly elevated low-grade inflammatory profile through salivary cytokines, with IL-1β and TNF-α demonstrating strong potential as non-invasive diagnostic markers, alongside traditional androgen measures like FAI.

This case study reported that scalp dermoscopy, or trichoscopy, provided a useful noninvasive method to evaluate and confirm hair regrowth in a child treated for tinea capitis.

In this study, gene expression analysis of plucked hair follicles from scalp lesions was sufficient to differentiate chronic discoid lupus erythematosus from psoriasis and healthy controls, suggesting a non-invasive diagnostic potential.

This review discusses the evolution and potential of non-invasive imaging techniques for diagnosing scalp diseases, highlighting their advantages and limitations compared to trichoscopy and scalp biopsy, the current diagnostic standards.

The authors concluded that trichoscopy is a valuable noninvasive tool for diagnosing and monitoring nonscarring alopecia, aiding in the identification of new hair signs in difficult cases.