44 citations
,
January 2006 in “Biological & Pharmaceutical Bulletin” This research suggests that testosterone-induced expression of TGF-beta1 and type I procollagen may lead to perifollicular fibrosis in androgenetic alopecia, with finasteride inhibiting this process as a possible mechanism for its effects.
30 citations
,
October 1994 in “Journal of Cutaneous Pathology” This article describes a case of multiple perifollicular fibromas and suggests that cases previously reported as such might actually be instances of Birt‐Hogg‐Dubé syndrome.
26 citations
,
April 2012 in “PubMed” In this study, myofibroblasts in rat cutaneous fibrosis were characterized by expressions of vimentin, α-SMA, and Thy-1, and may derive from pericytes or perifollicular dermal sheath cells.
12 citations
,
April 2004 in “PubMed” This study reports the first known case of multiple type nevus lipomatosus cutaneous superficialis in a 10-month-old girl, with the unique feature of perifollicular fibrosis.
April 2026 in “Brazilian Journal of Hair Health” This narrative review highlights current insights into how perifollicular fibrosis contributes to androgenetic alopecia, by hindering hair regrowth and treatment response, and outlines potential antifibrotic therapies, though conclusive evidence from randomized controlled trials is still needed.
10 citations
,
June 1998 in “International Journal of Dermatology” This article discusses inflammatory perifollicular fibrosis and alopecia but provides no new research findings.
19 citations
,
November 1985 in “Archives of Dermatology” This case study documented a black male newborn developing large bullae that healed with hypopigmentation, suspecting proteolytic enzymes in keratinocytes caused the collagenolysis responsible for the condition.
2 citations
,
December 2013 in “Journal of Cosmetic Dermatology” This study found that ultraviolet treatment for skin conditions such as vitiligo can damage hair, with psoralen plus ultraviolet A causing more follicle damage than narrow band ultraviolet B.
11 citations
,
January 2013 in “Indian Dermatology Online Journal” This article reviews central centrifugal cicatricial alopecia, including its various forms and potential multifactorial causes, but provides no new clinical findings.
42 citations
,
June 2009 in “Journal of Cosmetic Dermatology” In this study, researchers observed that follicular microinflammation significantly contributes to the early stages of male androgenetic alopecia, potentially leading to perifollicular fibrosis and follicle destruction as the condition progresses.
4 citations
,
August 1991 in “The Journal of Dermatology” This case report describes a rare pedunculated follicular hamartoma on the nasal septum of a 77-year-old Japanese male, emphasizing its unique clinical and pathological features.
July 2024 in “Journal of Investigative Dermatology” CD8+ T cells attack hair follicle stem cells, causing scarring and hair loss in Discoid Lupus.
July 2022 in “The journal of investigative dermatology/Journal of investigative dermatology” This case report reveals a diagnosis of scurvy in a 19-year-old woman, emphasizing the importance of considering vitamin C deficiency in patients with dietary restrictions presenting with specific skin and gum symptoms.
October 2021 in “Technology transfer: innovative solutions in medicine” This study found that combining platelet-rich plasma injections with topical 2% minoxidil for three months normalized certain immunohistochemical parameters in female patients with early-stage androgenetic alopecia.
12 citations
,
February 1999 in “British Journal of Dermatology” In this study, topical minoxidil was reported to increase fenestration in follicular capillary walls around anagen hair bulbs in male rats.
82 citations
,
November 1985 in “Archives of Dermatology” This case report describes a black male newborn who developed bullae that healed with hypopigmentation, linked to collagenolysis and RER vacuoles potentially containing proteolytic enzymes.
13 citations
,
January 2013 in “International Journal of Trichology” This study found that androgenetic alopecia patients showed significantly higher perifollicular lymphocytic inflammation and fibrosis compared to controls, emphasizing the need for histopathological evaluation during hair transplantation.
January 2026 in “Clinical Cosmetic and Investigational Dermatology” This study found that targeting both hormonal and immune pathways improved treatment outcomes in androgenetic alopecia patients with an under-recognized inflammatory component called PIILIF, which may contribute to treatment resistance.
21 citations
,
March 2019 in “Experimental Dermatology” This review discusses the role of perifollicular macrophages in hair growth and suggests targeting them could be relevant for managing hair growth disorders, but reports no new results.
May 2026 in “Frontiers in Cell and Developmental Biology” In this study, researchers suggest that hair follicle miniaturization in conditions like androgenetic alopecia may result from impaired conversion of quiescent stem cells to progenitor cells, influenced by the follicular niche, its collagen network, and various mechanical constraints.
32 citations
,
February 2008 in “Journal of the American Academy of Dermatology” This case report describes a family with autosomal dominant transmission of keratosis follicularis spinulosa decalvans, with observed treatment refractoriness in multiple topical and systemic therapies.
4 citations
,
September 2012 in “Journal of dermatological science” The hair follicle's connective tissue is a key source of a certain collagen in human scalp skin.
2 citations
,
November 2018 in “Veterinary Dermatology” This study found that in poodles, perifollicular changes in the hair follicle glassy membrane are not always linked to calcium deposition.
1 citations
,
April 2016 in “Actas Dermo-Sifiliográficas” Wearing a wig caused a woman's skin condition to worsen due to pressure from the wig's fasteners.
19 citations
,
July 2009 in “Clinical and Experimental Dermatology” This article discusses how the balding scalp's exposure to UV and near-infrared light may accelerate aging, with changes detectable under ultraviolet light; it presents no new clinical findings.
19 citations
,
February 2008 in “Archives of Dermatological Research” This study observed that mast cells and increased collagen and elastic fibers in the scalp may contribute to male pattern hair loss, but additional research is needed for further understanding.
1 citations
,
July 2018 in “Journal of dermatology & cosmetology” This case report describes a treatment approach for frontal and temporal alopecia using oral dutasteride, minoxidil lotion, and triamcinolone injections, with hyaluronic acid successfully treating injection site atrophy.
January 2026 in “Journal of Cutaneous Immunology and Allergy” In this case report, a young Japanese man was diagnosed with scalp IgG4-related disease, which mimicked acne keloidalis nuchae but was identified by histopathology and elevated serum IgG4 levels as a systemic fibroinflammatory disorder, highlighting the importance of differential diagnosis in atypical scarring alopecia.
October 2021 in “The Egyptian Journal of Hospital Medicine ” This study concluded that combination therapies often yield better results for treating atrophic post-acne scars than single treatments.
In this study, collagen type I, skin fibroblasts, and macrophages did not show remarkable changes in androgenic alopecia patients' scalp tissues after treatment with 1550 nm fractional Er:Glass laser, despite improved hair regrowth.