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Glossary Hair Diameter Variability

differences in thickness of individual hair strands

Hair Diameter Variability refers to the differences in the thickness of individual hair strands on a person's scalp. This variability can be influenced by factors such as genetics, age, hormonal changes, and health conditions. For professionals, understanding hair diameter variability is crucial for diagnosing hair disorders and tailoring treatments for conditions like alopecia.

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Research

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research A clinico-trichoscopic analysis of hair density and diameter variability in relation to severity grading of female pattern hair loss

September 2022 in “International Journal of Trichology”

This study found that trichoscopic measurements of hair density and diameter are useful for assessing the severity of female pattern hair loss and its progression.

research Shape Variability and Classification of Human Hair: A Worldwide Approach

95 citations , January 2007 in “Human biology”

This study proposes a new, objective method to classify human hair into eight categories based on specific shape measurements, rather than traditional ethnicity-based classifications.

research A case series of trichoscopy patterns in hair loss patients with iron deficiency anemia

September 2026 in “Journal of Hair Restoration and Regenerative Medicine”

These case reports describe severe anemia linked to hair loss, showing improvement in trichoscopic findings after anemia correction, suggesting a potential association.

research Clinicopathological, trichoscopic and biochemical parameters in females with patterned hair loss

December 2021 in “International Journal of Research in Dermatology”

This study found that while female pattern hair loss in young to middle-aged women was commonly associated with markers of hyperandrogenism and specific histopathological features, its exact causes and treatment remain unclear.

research Trichoscopy as an essential diagnostic technique for hair and scalp disorders in skin of color: A case-control study

July 2021 in “Indian journal of dermatopathology and diagnostic dermatology”

In this study, researchers documented several trichoscopic features that were statistically significant indicators of alopecia and scalp disorders compared to healthy controls.

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Community Join

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community Seeking Suggestions for VEGF Gene Therapy in Hair Transplants

in Research 112 upvotes 5 months ago

A user is exploring VEGF gene therapy to enhance hair transplant results, considering measuring hair shaft diameter and growth rate. Suggestions include using phototrichograms and possibly adding PRP, though its effectiveness is uncertain.

community Last Post Before I Switch Back to Finasteride From Dutasteride

in Finasteride/Dutasteride 29 upvotes 1 year ago

The user plans to switch from dutasteride back to finasteride due to worsening hair loss, possibly due to increased scalp testosterone. Others report mixed results with both treatments, showing individual variability.

community Hair cloning breakthrough, this might just be the big one ?

418 upvotes 7 months ago

Japanese scientists discovered ABM cells, enabling successful human hair follicle cloning, potentially curing hair loss. The treatment may be available in Japan by 2028, but it will be expensive and require travel.

community Severe dry eye: finasteride vs dutasteride

8 upvotes 5 years ago

Woman uses antiandrogens for hair thinning prevention, experiences severe dry eye with finasteride. Asks if dutasteride could be better despite potential for worse dry eye.

community Literally all of my friends now that we’re 25

627 upvotes 5 months ago

Hair loss treatments like minoxidil, finasteride, dutasteride, and RU58841. Users stress early prevention and discuss challenges with different hair loss patterns.

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Learn

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learn Finasteride

Does hair strand thickness decrease in men with androgenic alopecia? Can finasteride help restore it? Androgenic alopecia thins hair strands by miniaturizing follicles. The pivotal finasteride trials (1,553 men, 1 mg/day, two years) report increased hair counts and improved assessed appearance, but they measured density, not the diameter of individual strands, so the effect on thickness itself is not established.

learn Fluridil

Can daily Fluridil application stop hair follicle miniaturization? The single published fluridil trial (43 men; placebo-controlled for 3 months, then all on fluridil to 9 months) reported more hairs in the growth phase, but it never measured follicle diameter and has not been replicated — so whether daily use stops miniaturization is unproven, and community users describe stabilization rather than regrowth.

learn Caffeine

Stimulant used in hair shampoos and lotions

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