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GlossaryTelogen Count

number of hair follicles in the resting phase

Telogen Count refers to the number of hair follicles in the telogen phase, which is the resting phase of the hair growth cycle. During this phase, hair is not actively growing and is eventually shed. A higher telogen count can indicate hair loss conditions such as telogen effluvium, where an abnormal number of hairs enter the resting phase simultaneously.

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The Role of Hair Follicle Counts and Ratios in the Histopathological Assessment of Androgenic Alopecia, Alopecia Areata and Telogen Effluvium: Does Counting 'Count'?

research THE ROLE OF HAIR FOLLICLE COUNTS AND RATIOS IN THE HISTOPATHOLOGICAL ASSESSMENT OF ANDROGENIC ALOPECIA, ALOPECIA AREATA AND TELOGEN EFFLUVIUM: DOES COUNTING ‘COUNT’?

March 2023 in “Human Pathology”

Hair follicle counts and ratios are helpful in diagnosing hair loss types, but should be used with other specific features for accurate diagnosis.

Effects of Platelet-Rich Plasma on Hair Follicle Count and Hair Ratios in Androgenic Alopecia: Alone or Combined with Other Treatments

research Effects of platelet-rich plasma application on hair follicle count, telogen/anagen ratio, and miniaturized hair ratio in patients with androgenic alopecia: alone or in combination with other treatments

July 2025 in “Journal of Dermatological Treatment”

PRP improves hair growth in androgenic alopecia, especially when combined with minoxidil.

Correlation Between Serum Ferritin and Hemoglobin Level in Females With Hair Fall in Chronic Telogen Effluvium

research Correlation between Serum Ferritin and Haemoglobin Level in Females with Hair Fall Count in Females with Chronic Telogen Effluvium

June 2023 in “Annals of the College of Medecine”

Low iron levels are linked to more hair loss in women with chronic hair shedding.

research Hair Counts from Normal Scalp Biopsy in Taiwan

24 citations , September 2012 in “Dermatologic Surgery”

The conclusion is that normal scalp hair counts for Taiwanese people were established, showing age-related differences but not sex or scalp location differences.

research A simple immunofluorescence technique for simultaneous visualization of mast cells and nerve fibers reveals selectivity and hair cycle - dependent changes in mast cell - nerve fiber contacts in murine skin

109 citations , April 1997 in “Archives of Dermatological Research”

Mast cell and nerve fiber interactions in mouse skin change with the hair cycle.

research Variation of Hair Follicle Counts among Different Scalp Areas: A Quantitative Histopathological Study

11 citations , September 2021 in “Skin Appendage Disorders”

Hair count values should be standardized for each scalp region to evaluate hair disorders in Asians.

research Evaluation of Hair Follicle Counts of Occipital Scalp Biopsies from Male Hair Transplant Patients in Thailand

1 citations , February 2023 in “Siriraj Medical Journal/San Sirirat”

Thai males with hair loss have lower hair density in the occipital scalp compared to other Asians.

research Counting Hairs: Is It Androgenetic Alopecia or Chronic Telogen Effluvium?

November 2005 in “NEJM Journal Watch”

Hair count is important to distinguish between genetic hair thinning (Androgenetic Alopecia) and hair thinning caused by disrupted hair growth (Chronic Telogen Effluvium).

research Scalp Psoriasiform Contact Dermatitis with Acute Telogen Effluvium due to Topical Minoxidil Treatment

14 citations , January 2015 in “Skin appendage disorders”

Minoxidil treatment for hair loss can cause scalp allergy and severe hair loss.

research A Novel Hair Restoration Technology Counteracts Androgenic Hair Loss and Promotes Hair Growth in A Blinded Clinical Trial

1 citations , January 2023 in “Journal of Clinical Medicine”

A new hair restoration technology was found to effectively increase hair thickness, density, and growth, while reducing hair loss and improving scalp health, with no side effects.

Alcohol Extract from Vernonia Anthelmintica Seed Counteracts Stress-Induced Murine Hair Follicle Growth Inhibition

research Alcohol extract from Vernonia anthelmintica willd (L.) seed counteracts stress-induced murine hair follicle growth inhibition

6 citations , December 2019 in “BMC Complementary and Alternative Medicine”

Alcohol extract from Vernonia anthelmintica seeds may help treat stress-related hair loss.

research mTOR signaling promotes stem cell activation via counterbalancing BMP-mediated suppression during hair regeneration

71 citations , January 2015 in “Journal of molecular cell biology/Journal of Molecular Cell Biology”

mTOR signaling helps activate hair stem cells by balancing out the suppression caused by BMP during hair growth.

research Non-scarring Alopecias in Iranian Patients: A Histopathological Study With Hair Counts.

2 citations , January 2018 in “DOAJ (DOAJ: Directory of Open Access Journals)”

The most effective way to diagnose non-scarring hair loss is by transverse sectioning, and some cases, particularly in males with inflammation around hair follicles, might be curable.

research EEMCO Guidance for the Assessment of Hair Shedding and Alopecia

51 citations , January 2004 in “Skin Pharmacology and Physiology”

The document explains hair growth and shedding, factors affecting it, and methods to evaluate hair loss, emphasizing the importance of skin biopsy for diagnosis.

The Effectiveness and Safety Evaluation of Hair Growth Promoter Containing Teak Leaf Extract

research The effectiveness and safety evaluation of hair growth promotor containing teak leaf extract

January 2024 in “http://isrctn.com/”

Teak leaf extract hair tonic was tested for hair growth and safety.

research Use of 5% Topical Minoxidil Application for Telogen Effluvium: An Open‐Label Single‐Arm Clinical Trial

July 2025 in “The Journal of Dermatology”

5% topical minoxidil may help reduce hair loss and increase hair growth in telogen effluvium.

research Crash Dieter's Hair Loss

February 1976 in “JAMA”

Rapid weight loss can cause temporary hair loss, but hair usually grows back.

research Evaluation of biophysical skin parameters and assessment of hair growth in patients with acne treated with isotretinoin

37 citations , January 2013 in “Postepy Dermatologii I Alergologii”

Isotretinoin effectively reduces acne but causes dry skin, higher skin pH, more redness, and hair loss.

research How to Diagnose Hair Loss

27 citations , September 2012 in “Dermatologic Clinics”

The document concludes that using specific tools and tests is essential for identifying the cause of hair loss and deciding on the right treatment.

research Evaluation of hair loss

21 citations , May 1996 in “Current problems in dermatology”

Detailed patient history and physical exams are crucial for diagnosing hair loss.

research Natural Hair Supplement: Friend or Foe? Saw Palmetto, a Systematic Review in Alopecia

8 citations , January 2020 in “Skin appendage disorders”

Saw palmetto supplements may modestly improve hair regrowth with few side effects, but more research is needed.

research Nonscarring hair loss disorders

3 citations , October 1982 in “Postgraduate Medicine”

Most types of hair loss can regrow naturally, but there are no effective cures for male pattern or age-related hair loss, and only limited options for females.

Comparing Single-Spin Versus Double-Spin Platelet-Rich Plasma Centrifugation Methods on Thrombocyte Count and Clinical Improvement of Androgenetic Alopecia: A Preliminary, Randomized, Double-Blind Clinical Trial

research Comparing Single-spin Versus Double-spin Platelet-rich Plasma (PRP) Centrifugation Methods on Thrombocyte Count and Clinical Improvement of Androgenetic Alopecia: A Preliminary, Randomized, Double-blind Clinical Trial.

December 2023 in “PubMed”

Both single-spin and double-spin PRP methods effectively treat hair loss, with single-spin slightly increasing platelet count more.

research Hair loss.

5 citations , October 1984 in “The BMJ”

Up to 50% of scalp hair can be lost before it appears thin, and treatment is only needed for hair loss caused by diseases or deficiencies.

research Hair anatomy for the clinician

139 citations , July 1991 in “Journal of The American Academy of Dermatology”

Understanding hair follicle anatomy helps diagnose hair disorders.

research Diffuse Hair Loss Following Multiple Honeybee Stings

1 citations , January 1997 in “Dermatology”

A woman lost her hair from stress after a bee attack and her sister's death.

Hair Follicle Changes Following Intense Pulsed Light Axillary Hair Reduction: Histometrical, Histological, and Immunohistochemical Evaluation

research Hair follicle changes following intense pulsed light axillary hair reduction: histometrical, histological and immunohistochemical evaluation

8 citations , February 2017 in “Archives of Dermatological Research”

Intense pulsed light treatment effectively reduces underarm hair by making hair follicles smaller and extending their resting phase.

research Results of low‐level laser therapy in the treatment of hair growth: An Egyptian experience

2 citations , March 2021 in “Dermatologic Therapy”

Low-level laser therapy helps increase hair growth in female pattern hair loss but not in telogen effluvium.

research 1417 Interest of a cinchona succirubra extract and its association with caffeine in hair loss

April 2023 in “Journal of Investigative Dermatology”

Cinchona succirubra extract with caffeine improves hair growth and reduces hair loss.

research Effects of the RV3466F lotion on female telogen effluvium: Results from a 16 week, multi-centric, controlled, randomized trial

August 2019 in “Journal of The American Academy of Dermatology”

RV3466F lotion significantly reduces hair loss and improves acute telogen effluvium.