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Adipose Infiltration of the Dermis, Involving the Arrector Pili Muscle, and Dermal Displacement of Eccrine Sweat Coils: New Histologic Observations in Frontal Fibrosing Alopecia

research Adipose Infiltration of the Dermis, Involving the Arrector Pili Muscle, and Dermal Displacement of Eccrine Sweat Coils: New Histologic Observations in Frontal Fibrosing Alopecia

6 citations , January 2019 in “The American Journal of Dermatopathology”

This study discovered that adipose tissue infiltration at the isthmus level appears significantly more often in frontal fibrosing alopecia cases compared to controls, suggesting a potential role in the condition's pathology.

research Seborrheic karatosis, a tumor of the infundibular and isthmus of hair follicles: Identification of hair sheath keratins and histopathological features suggesting hair follicle origin.

2 citations , January 1989 in “The Nishinihon Journal of Dermatology”

This study found that seborrheic keratosis lesions contain high levels of hair sheath keratin, suggesting they may originate from the upper hair follicle.

research Alopecia areata with lymphocytic mural folliculitis affecting the isthmus in a thoroughbred mare

14 citations , August 2004 in “Veterinary Dermatology”

In this study, a thoroughbred mare exhibited a unique case of alopecia areata with lymphocytic infiltration at both the bulbar and isthmic levels of hair follicles.

research The Arrector Pili Muscle and the Follicular Unit of the Scalp

2 citations , September 2002 in “Dermatologic Surgery”

This study describes how arrector pili muscles form a single muscular structure shared by all hair follicles within a follicular unit at the isthmus level in scalp skin.

Morphometric Analysis of the Human Scalp Hair Follicle: Practical Implications for the Hair Transplant Surgeon and Hair Regeneration Studies

research Morphometric Analysis of the Human Scalp Hair Follicle: Practical Implications for the Hair Transplant Surgeon and Hair Regeneration Studies

51 citations , November 2010 in “Dermatologic Surgery”

This study measured the lengths and depths of different portions of occipital scalp hair follicles and suggested cutting below 1 mm for hair regeneration procedures to avoid damaging the bulge zone.

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community Microneedling depth. Does one length fit all areas of the scalp? Maybe not.

55 upvotes 4 years ago

Microneedling depth should be customized based on hair type and scalp area, with many users finding 0.5-0.6mm effective for miniaturized hairs to avoid damage. Users report varying pain levels and results, with some preferring shorter needle lengths and others using longer ones like 1.75mm for scalp health and density improvement.

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