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GlossaryExogen

final phase of hair cycle when hair sheds naturally

Exogen is the final phase of the hair growth cycle, during which the hair shaft is released from the follicle and sheds naturally. This phase follows the telogen phase and precedes the growth of new hair in the anagen phase. Understanding exogen is crucial for professionals dealing with hair loss conditions, as it helps in diagnosing and treating various forms of alopecia.

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Exogenous Testosterone Alone or with Finasteride Increases Physical Performance, Grip Strength, and Lean Body Mass in Older Men with Low Serum Testosterone

research Exogenous Testosterone (T) Alone or with Finasteride Increases Physical Performance, Grip Strength, and Lean Body Mass in Older Men with Low Serum T

506 citations , March 2005 in “The Journal of Clinical Endocrinology and Metabolism”

Testosterone therapy improves physical function, strength, and body composition in older men with low testosterone levels.

research Exogenous Testosterone or Testosterone with Finasteride Increases Bone Mineral Density in Older Men with Low Serum Testosterone

417 citations , February 2004 in “The Journal of Clinical Endocrinology and Metabolism”

Testosterone therapy increases bone density in older men with low testosterone levels.

research Exogen, Shedding Phase of the Hair Growth Cycle: Characterization of a Mouse Model

107 citations , September 2002 in “Journal of Investigative Dermatology”

Researchers found that hair shedding happens mostly when new hair is growing and involves a unique process.

research Exogenous IGF-1 promotes hair growth by stimulating cell proliferation and down regulating TGF-β1 in C57BL/6 mice in vivo

53 citations , March 2014 in “Growth Hormone & IGF Research”

IGF-1 injections help mice grow more hair by increasing cell growth and blocking a hair growth inhibitor.

research Exogen hair characterization in human scalp

35 citations , March 2007 in “Skin Research and Technology”

The conclusion is that exogen is a unique hair cycle phase and the new sampling method specifically targets this stage, which may help in future hair loss research.

research Diagnostic utility of dermatoscopy in hydroquinone‐induced exogenous ochronosis

34 citations , February 2012 in “International Journal of Dermatology”

Dermatoscopy can help identify hydroquinone-induced skin issues, avoiding invasive biopsies.

research Exogenous calreticulin improves diabetic wound healing

33 citations , September 2012 in “Wound Repair and Regeneration”

Applying calreticulin can speed up wound healing in diabetics.

research Exogeneous metal ions as therapeutic agents in cardiovascular disease and their delivery strategies

24 citations , November 2023 in “Regenerative Biomaterials”

Metal ions can help treat heart diseases by protecting cells and repairing tissues.

Exogenous Stimulation with Eclipta Alba Promotes Hair Matrix Keratinocyte Proliferation and Downregulates TGF-β1 Expression in Nude Mice

research Exogenous stimulation with Eclipta alba promotes hair matrix keratinocyte proliferation and downregulates TGF-β1 expression in nude mice

24 citations , December 2014 in “International Journal of Molecular Medicine”

Eclipta alba extract helps increase hair growth and decrease hair loss-related protein in mice.

research Exogenous and endogenous lipids of human hair

21 citations , March 2017 in “Skin research and technology”

Removing external lipids from hair reduces moisture and increases strength, while removing internal lipids decreases water permeability.

Exogen Involves Gradual Release of the Hair Club Fiber in the Vibrissa Follicle Model

research Exogen involves gradual release of the hair club fibre in the vibrissa follicle model

14 citations , January 2009 in “Experimental Dermatology”

Hair sheds gradually from the follicle, with readiness to shed indicated by less attachment material.

research Exogenous Factors in Hair Disorders

11 citations , January 2004 in “Exogenous dermatology”

Outside factors like grooming, chemicals, and the environment can damage hair and cause disorders.

research The homing of exogenous hair follicle mesenchymal stem cells into hair follicle niches

6 citations , November 2023 in “JCI Insight”

Exogenous stem cells can effectively integrate into hair follicles, promoting hair growth.

research Treatment of Exogenous Ochronosis With Advanced Fluorescence Technology

5 citations , August 2014 in “Dermatologic surgery”

Advanced fluorescence technology effectively treats skin discoloration from certain creams.

research Exogenous Alpha-Ketoglutaric Acid Alleviates the Rabbit Dermal Papilla Cell Oxidative Damage Caused by Hydrogen Peroxide Through the ERK/Nrf2 Signaling Pathway

4 citations , April 2025 in “Antioxidants”

Alpha-ketoglutarate protects rabbit skin cells from oxidative damage by activating a specific cell pathway.

research Exogenous testosterone, finasteride and castration effects on testosterone, insulin, zinc and chromium in adult male rats.

4 citations , January 2013 in “PubMed”

Testosterone and finasteride raise insulin and zinc, lower chromium in male rats.

research Exogen Hairs in Women with and without Hair Loss

2 citations , January 2017 in “Skin appendage disorders”

Women with and without hair loss have similar amounts of exogen hairs, so these hairs are not a key factor in hair loss conditions.

research Exogenous stimulations change nude mouse hair cycle pattern

2 citations , October 2010 in “Journal of dermatological treatment”

External treatments can change hair growth patterns in nude mice.

research [Exogenous zinc deficiency syndrome].

2 citations , October 1982 in “PubMed”

Oral zinc supplements quickly resolved skin issues from zinc deficiency.

research MOLECULAR AND CELLULAR BASIS OF EXOGEN AND ANAGEN INDUCTION

January 2007 in “Durham e-Theses (Durham University)”

Hair growth and shedding involve specific cell changes and gene roles.

Early Dissecting Cellulitis of the Scalp Following Repeated Microinfusion of Medication Into the Skin in a Patient With Androgenetic Alopecia and Long-Term Exogenous Testosterone Use: A Case Report

research Early Dissecting Cellulitis of the Scalp Following Repeated Microinfusion of Medication Into the Skin in a Patient With Androgenetic Alopecia and Long-Term Exogenous Testosterone Use: A Case Report

May 2026 in “Cureus”

Microinfusion therapy and testosterone use may cause scalp inflammation, requiring early recognition and treatment.

Synergistic Innovative Therapies in Dermatology: Integrating Platelet Derivatives, Biomaterials, and Exogenous Bioactive Substances for Enhancing Skin Repair and Regeneration

research Synergistic Innovative Therapies in Dermatology: Integrating Platelet Derivatives, Biomaterials, and Exogenous Bioactive Substances for Enhancing Skin Repair and Regeneration

September 2025 in “Drug Design Development and Therapy”

Combining platelet-rich products, biomaterials, and bioactive substances may improve skin treatment, but more research is needed.

research Exogenous IL-27 prevents the development of alopecia areata

May 2024 in “The Journal of Immunology”

IL-27 can prevent hair loss in alopecia areata.

research Association between exogenous testosterone use and new diagnosis of hidradenitis suppurativa: A case series

November 2023 in “JAAD case reports”

Exogenous testosterone use may be linked to developing hidradenitis suppurativa.

Suspected Calcinosis Cutis and Demodicosis Secondary to Exogenous Steroid Administration in a Dog with Hypoadrenocorticism

research Suspected Calcinosis Cutis and Demodicosis, Secondary to an Exogenous Steroid Administration in a Dog with Hypoadrenocorticism

January 2020 in “Frontiers in Medical Case Reports”

A dog developed skin issues from too many steroids, but reducing steroids and using a specific treatment fixed the problems.

research Exogenous Melatonin Promotes Expression Differences of Skin Hair Follicles Related Genes in Cashmere Goat

January 2016 in “Xumu Shouyi Xuebao”

research Exogenous Testosterone Alone or with Finasteride Increases Physical Performance, Grip Strength, and Lean Body Mass in Older Men with Low Serum Testosterone

January 2005 in “Journal of Investigative Medicine”

Testosterone boosts physical performance, grip strength, and lean body mass in older men with low testosterone.