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Open research questions in Hair Growth and Disorders

478 gap statements mined from Hair Growth and Disorders papers in our 7.9M-paper local library, which holds 2,049 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • The meeting highlights the need for further research on the skin microbiome and exposome factors in dermatological treatments.

    Chronicles of A.I. Pospelov Moscow Society of Dermatovenereologists and Cosmetologists (MSDC was founded on October 4, 1891) Bulletin of the MSDС № 1167 · 2026 · DOI

  • One challenge is the limited understanding of the underlying mechanisms of hair loss. Another challenge is the need for effective and safe treatments for hair loss. The paper also faces the challenge of evaluating the potential of a new treatment, blue honeysuckle fruit extract, for hair loss.

    Blue honeysuckle (Lonicera caerulea L.) fruit extract promotes hair growth via β-catenin signaling pathway · 2026 · DOI

  • Current treatments for hair loss have limitations. There is a need for new and effective treatments for hair loss. The paper addresses this gap by investigating the effect of blue honeysuckle fruit extract on hair growth.

    Blue honeysuckle (Lonicera caerulea L.) fruit extract promotes hair growth via β-catenin signaling pathway · 2026 · DOI

  • The study mentions the need for longitudinal studies to better understand this relationship. The study highlights the complexity of the immune dysregulation underlying AA.

    Detection of Serum Levels of Interleukins-17, 21, 6 and Tumor Necrosis Factor-α in Patients with Patchy Alopecia Areata and Their Association with Disease Severity · 2025 · DOI

  • There is a need to investigate the relationship between hair loss and biomarkers such as hemoglobin, iron, and thyroid hormones.

    Quantitative Analysis of Selected Circulating Hematological Biomarkers, Essential Minerals, Vitamins, and Thyroid Hormones in Females Affected by Hair Loss · 2025 · DOI

  • Necroptosis, a form of programmed cell death, promotes inflammation in immune‐mediated diseases, but its role in alopecia areata (AA) remains unclear.

    Integrated Analysis of Macrophage‐Associated Necroptosis in Alopecia Areata · 2026 · DOI

  • Female-pattern hair loss is common in obese women with polycystic ovary syndrome (PCOS), recently proposed as polyendocrine metabolic ovarian syndrome (PMOS) and is often associated with hypertriglyceridemia (TG), although the underlying mechanisms remain unclear.

    Diet‐Induced Obesity Promotes Alopecia Through Oxidative Stress and Androgen Signalling in Female Mice · 2026 · DOI

  • The molecular basis of this paradoxical effect remains incompletely understood, hindering optimization of GCs as.

    Altered cellular phenotypes and a limited yet inflammation-focused transcriptional response induced by dexamethasone in caprine dermal papilla cells · 2026 · DOI

  • As the present analysis focused on pre-post changes within each group, direct comparison of the magnitude of changes between groups warrants further investigation.

    Changes in Hair Condition of Women in Their 20s After 8 Weeks of Using a Shampoo Containing Fermented Lactic Acid Bacteria-Derived Ingredients · 2026 · DOI

  • Active disease is characterised by a peribulbar proinflammatory infiltrate, HF immune privilege collapse and premature catagen induction, yet the underlying drivers of AA remain poorly understood.

    Metabolic and Vascular Inflammation in Alopecia Areata: Linking Uric Acid, Lipid Imbalance and ICAM ‐1 Upregulation · 2025 · DOI

  • Although the authors cooperated and submitted data, the materials provided did not meet the standards for raw data and were insufficient to validate the figures.

    EXPRESSION OF CONCERN : Dermal Papilla Cell‐Secreted Biglycan Regulates Hair Follicle Phase Transit and Regeneration by Activating Wnt/β‐Catenin · 2025 · DOI

  • Adipose-derived stem cells (ADSC) show therapeutic potential, but their mechanisms in promoting hair regrowth, particularly under oxidative stress conditions, remain unclear.

    Oxidative stress activates the transplanted adipose-derived stem cells to exert antioxidant effects in alopecia treatment · 2025 · DOI

  • Despite these presumptive feather cell types being well characterized morphologically, little is known about how gene regulation contributes to their development.

    Genetic Characterization of the Cell Types in Developing Feathers, and the Evolution of Feather Complexity · 2025 · DOI

  • However, the exact role of IGF binding protein-related protein 1 (IGFBP-rP1) in hair growth and AGA has not been reported.

    IGFBP‐rP1 is a potential therapeutic target in androgenic alopecia · 2024 · DOI

  • Stress-induced hair loss is a prevalent health concern, with mechanisms that remain unclear, and effective treatment options are not yet available.

    M1 polarization of macrophages promotes stress‐induced hair loss via interleukin‐18 and interleukin‐1β · 2024 · DOI

  • Autologous stem cell therapy shows promising efficacy and should be investigated further to improve the treatment efficacy of AGA.

    337 A Review of Autologous Stem Cell-Based Therapy as a Potential Treatment Option for Androgenetic Alopecia · 2024 · DOI

  • Lack of understanding of donor-area involvement in diffuse unpatterned alopecia. Limited knowledge of the effectiveness of medical therapy in patients with diffuse unpatterned alopecia.

    Case Report: Paired vertex-occipital assessment reveals donor-area involvement in diffuse unpatterned alopecia · 2026 · DOI

  • There is a need for the development of herbal cosmetics with lower negative effects and greater safety. The paper identifies a gap in the formulation and evaluation of poly herbal hair oils.

    PREPARATION AND EVAULATION OF POLY HERBAL HAIR OIL BY USING LINUM USITATISSIMUM · 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

  • The study faced challenges in terms of limited sample size, which may affect model stability. The study had to account for potential confounding among interrelated variables.

    Clinical characteristics and factors associated with different BASP subtypes of androgenetic alopecia · 2026 · DOI

  • The study has a limited sample size, which may affect model stability. The subtype-specific findings, particularly those derived from smaller BASP subgroups, should be interpreted cautiously.

    Clinical characteristics and factors associated with different BASP subtypes of androgenetic alopecia · 2026 · DOI

  • PM2.5 exposure can have negative effects on various systems, including reproductive and skin systems. The dermal system is particularly vulnerable to PM2.5 exposure. There is a need to develop new treatments for postpartum hair loss.

    Particulate matter exposure induces maternal scalp hair loss after birth in C57/B6 mouse via alteration of inflammatory and apoptotic pathways · 2026 · DOI

  • Hair loss in adolescents carries significant psychosocial impact, and it is often underrecognized and managed without adolescent-specific approaches.

    Assessment and treatment of adolescent hair loss · 2026 · DOI

  • Although VEGF, IGF-1 and FGF are positively associated with hair growth, few studies have researched the effects of irisin on hair growth.

    Irisin promotes hair growth and hair cycle transition by activating the GSK ‐3β/β‐catenin pathway · 2024 · DOI

  • Larger studies to confirm the findings. Long-term follow-up to evaluate the sustainability of treatment outcomes. Investigation of other treatment options for diffuse unpatterned alopecia.

    Case Report: Paired vertex-occipital assessment reveals donor-area involvement in diffuse unpatterned alopecia · 2026 · DOI

Most-cited papers in Hair Growth and Disorders

Most recent work

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Open questions raised by papers listed on this page include: (1) There is a need for new and effective treatments for hair loss (“Blue honeysuckle (Lonicera caerulea L.) fruit extract promotes hair growth via…”, 2026); (2) Necroptosis, a form of programmed cell death, promotes inflammation in immune‐mediated diseases, but its role in alopecia areata (AA) remains unclear (“Integrated Analysis of Macrophage‐Associated Necroptosis in Alopecia Areata”, 2026); (3) The molecular basis of this paradoxical effect remains incompletely understood, hindering optimization of GCs as (“Altered cellular phenotypes and a limited yet inflammation-focused…”, 2026); (4) Lack of understanding of donor-area involvement in diffuse unpatterned alopecia (“Case Report: Paired vertex-occipital assessment reveals donor-area involvement…”, 2026); (5) There is a need for the development of herbal cosmetics with lower negative effects and greater safety (“PREPARATION AND EVAULATION OF POLY HERBAL HAIR OIL BY USING LINUM USITATISSIMUM”, 2026). 478 gap statements have been mined from Hair Growth and Disorders papers in our 7.9M-paper local library, which holds 2,049 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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