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Open research questions in Hair Growth and Disorders

30 unresolved questions extracted from the limitations and future-work sections of 389 Hair Growth and Disorders papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • We recently found that alopecia is a novel and previously unrecognized scalp phenotype in COL6-RM; however, the precise pathogenetic mechanisms underlying hair follicle dysfunction in these patients remain incompletely understood.

    Hair Follicle Microenvironment Changes in Collagen VI-Myopathy Patients with Alopecia · 2026 · DOI

  • However, the effects of dietary sodium hyaluronate (SH) and eggshell membrane (ESM), either alone or in combination, remain insufficiently characterized in cats.

    Dietary sodium hyaluronate and eggshell membrane improve skin barrier function and coat health in Ragdoll cats · 2026 · DOI

  • exosome treatment, human umbilical At present, the clinical translation of mechanism-defined miRNA therapeutics for hair regeneration remains at an early stage. Publicly available clinical-trial registries show that several exosome- or small extracellular vesicle-based approaches are being investigated for androgenetic alopecia, including studies evaluating cord mesenchymal stem cell-derived small extracellular vesicles, and exosome-based interventions compared with platelet-rich plasma. However, these trials should not be directly interpreted as clinical trials of defined miRNA mimics or miRNA inhibitors, because naturally derived vesicle products contain complex mixtures of miRNAs, proteins, lipids, and other bioactive molecules. Their therapeutic activity cannot be attributed to a specific miRNA unless the active cargo, dose, potency, and target engagement are experimentally validated. Therefore, future miRNA-based hair-regeneration therapies may develop along two complementary routes. The first route involves biologically derived or engineered vesicle products, in which pro-regenerative miRNAs are enriched or selectively loaded into exosomes or exosome-mimetic vesicles. The second route involves chemically defined miRNA mimics or inhibitors delivered by LNPs, polymeric nanoparticles, microneedles, or other local delivery systems. Experience from non-dermatological miRNA liposomal miR-34a mimic development in oncology, suggests that miRNA replacement therapeutics, such as therapy is biologically feasible but also highlights the importance of immune safety, dose control, and rigorous pharmacodynamic validation (Hong et al., 2020). For hair regeneration, future clinical studies should clearly distinguish between vesicle-based regenerative products and mechanism-defined miRNA drugs. Essential translational requirements include selection of pathway-relevant miRNA candidates, confirmation of target engagement in hair follicle stem cells or dermal papilla cells, alignment of dosing schedules with the hair cycle, standardized assessment of hair density and hair- shaft diameter, and long-term monitoring of local inflammation, fibrosis, and off-target tissue effects.

    MicroRNA-mediated regulation of hair follicle regeneration: mechanisms, delivery strategies, and translational perspectives · 2026 · DOI

  • Polymeric micelles emerge as next-generation nanocarriers for AGA therapy, offering superior follicular targeting, high encapsulation efficiency (>80%), and controlled release of drugs like minoxidil and finasteride.

    ANDROGENETIC ALOPECIA: FROM MOLECULAR MECHANISMS TO ADVANCED TOPICAL DELIVERY SYSTEMS WITH EMPHASIS ON POLYMERIC MICELLES · 2026 · DOI

  • Mechanistically, our data support a working model in which exosomal miR-21-5p targets the Wnt antagonist DKK2, thereby activating the Wnt/β-catenin signaling pathway and subsequently enhancing COL17A1 expression, though direct transcriptional evidence at the promoter level remains to be established.

    Mesenchymal stem cell-derived exosomes promote scalp rejuvenation through type XVII collagen regulation via the miR-21-5p/DKK2/Wnt pathway · 2026 · DOI

  • Although an association between alopecia areata (AA) and androgenic hormones has been recently suggested, the 2D to 4D ratio of AA has not yet been investigated.

    Is There an Association Between Male Alopecia Areata and the Ratio of Second to Fourth Finger Length? · 2024 · DOI

  • Although the formation mechanism of AA has not been fully elucidated, It is thought that it is a T cell-mediated autoimmune disease Alopesi areata (AA), sk grlen, skatris brakmayan, sa folikllerini ve bazen trnaklar da etkileyebilen, organa zg, otoimmn, kronik enflamatuvar bir hastalktr.

    Alopecia Areata: Current Review · 2021 · DOI

  • Alopecia neoplastica from breast cancer metastasis and follicular mucinosis in cutaneous T-cell lymphoma are presented as diagnostic entities recognizable by scalp biopsy, but the paper does not specify the histopathological features, immunohistochemical markers, or diagnostic algorithms needed to differentiate these conditions from androgenetic alopecia or alopecia areata in biopsy specimens.

    Alopecia in general medicine · 2016 · DOI

  • The paper mentions that sarcoidosis 'rarely' causes scalp scarring alopecia and characteristically involves scars, but provides no epidemiological data on the frequency of scalp involvement or natural history of hair regrowth following treatment. Prospective studies quantifying the prevalence of scalp sarcoidosis-induced alopecia and documenting treatment response with standardized hair loss scales are needed.

    Alopecia in general medicine · 2016 · DOI

  • Scalp fungal infections in adults are noted as uncommon but capable of mimicking scarring alopecias, yet the paper lacks specific guidance on which mycological pathogens most frequently present with inflammatory patchy hair loss versus scale or pustules. A systematic analysis of microbiology assessment data from cases with increased scale, broken hairs, or pustules is needed to establish diagnostic criteria differentiating fungal from other inflammatory alopecias.

    Alopecia in general medicine · 2016 · DOI

  • The paper identifies that frontal fibrosing alopecia (FFA) incidence has rapidly increased over the past 20 years, but states that 'why more cases of FFA are presenting is unclear but may represent an (as yet unknown) environmental factor in disease aetiology.' Future research should systematically investigate potential environmental exposures (cosmetic products, UV exposure, pollutants, dietary factors) in post-menopausal women presenting with FFA compared to age-matched controls without the condition.

    Alopecia in general medicine · 2016 · DOI

  • The physiological relevance of genes identified in RNA interference screens for epithelial stem cell self-renewal and long-term regeneration needs validation using tissue-specific genetic approaches beyond lentiviral RNAi knockdown. Conditional knockout studies in specific skin epithelial compartments (bulge, interfollicular epidermis, sebaceous gland) are needed to confirm functional roles.

    Epithelial Skin Biology · 2016 · DOI

  • The complex interactions between bulge stem cells and their microenvironment remain largely unexplored in skin epithelial biology. While recent studies show that bulge stem cells can mobilize new transcriptional networks to maintain stemness outside their niche, the full repertoire of stem cell-niche interactions during homeostasis and wound repair requires systematic investigation.

    Epithelial Skin Biology · 2016 · DOI

  • The temporal relationship between bulge stem cell niche formation and adult stem cell specification remains unresolved in hair follicle biology. Using embryonic pulse-chase labeling, early label-retaining cells expressing SOX9, TCF3/4, and LHX2 were identified, but whether stem cells are formed before their niche is established or only after niche formation occurs requires direct experimental investigation.

    Epithelial Skin Biology · 2016 · DOI

  • Despite decades of investigation using chromatin landscaping, lineage-tracing analyses, and genetics, the mechanistic role of WNT signaling in hair follicle placode formation remains incompletely understood. The instructive powers of WNT/β-catenin signaling and how it specifies follicle fate in epithelial tissue require further molecular characterization.

    Epithelial Skin Biology · 2016 · DOI

  • Despite the prevalence of androgenetic alopecia (AGA) and the acceptance of its associated psychological factors in women, few studies have directly queried women about which specific aspects of their lives are affected by hair thinning and the relative importance of such effects.

    Patient-Perceived Importance of Negative Effects of Androgenetic Alopecia in Women · 1999 · DOI

  • Sex differences in hair growth are clinically evident, but sex-dependent regulation of physiological hair cycling and injury-induced hair regeneration remains incompletely understood.

    Sex Differences in Physiological Hair Cycling and Adhesive Material-Induced Hair Regeneration in Mice · 2026 · DOI

  • Future research should focus on conducting long-term clinical trials to establish standardized dosing routines for new medications. However, the analysed data is lacking long-term evidence regarding the safety and permanent efficacy of these modern treatments.

    Alopecia Areata: Etiopathogenesis, Diagnostics and Treatment – A Literature Review · 2026 · DOI

  • Following six months of treatment with deuruxolitinib, the patient experienced his first clinically significant regrowth, limited to the eyebrows and eyelashes, while scalp involvement remained largely unchanged.

    Success of Deuruxolitinib (Leqselvi™) in Extensively Treatment-Resistant Alopecia Universalis: A Case Report · 2026 · DOI

  • An association with asthma has also been suggested although, to date, replication attempts have generated inconsistent results (23–26).

    Genome-wide association study of atopic and autoimmune comorbidities in alopecia areata · 2026 · DOI

  • Adrenaline infiltration may reduce intraoperative bleeding and improve visualization; however, its clinical impact and safety in recipient site preparation remain underreported.

    Adrenaline Infiltration in The Recipient Area During Follicular Unit Extraction Using the Implanter Technique: A Prospective Observational Study · 2026 · DOI

  • CONCLUSIONS: In conclusion, although preliminary results indicate a clear trend regarding the accordance between EtG results in head hair and non-head hair, interpretation of non-head hair results remains to be carefully done for pubic hair, for which often higher concentrations have been found.

    Ethyl Glucuronide Determination: Head Hair versus Non-Head Hair · 2008 · DOI

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30 open questions have been extracted from the limitations and future-work passages of 389 Hair Growth and Disorders papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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