Eyebrow growth pattern analysis in patients with eyebrow hypotrichosis after receiving topical treatment: A retrospective study

Abstract

Background: Differences in growth patterns among the various parts of the eyebrow have been observed. Aims: We aimed to investigate changes in the hair density and diameter and analyze the eyebrow growth pattern of each eyebrow part (head, body, and tail) in patients with eyebrow hypotrichosis over a 24-week course of topical treatment. Patients/Methods: A retrospective study of 48 patients who received treatment with bimatoprost 0.01% was conducted. Patient demographic data were collected; measurements of hair density and diameter in the different parts of the eyebrow were collected and statistically evaluated. Results: The tail of the eyebrow revealed the lowest baseline eyebrow density and diameter. Significant changes in eyebrow density (P = .01) and diameter (P = .01) were first detected in the tail at 4 and 16 weeks of treatment, respectively. The head and body showed a comparable growth pattern. Conclusions: This study confirms the previous observations that hair density, diameter, pattern of growth, and hair growth cycle vary according to their anatomical location within the eyebrow. A better understanding of eyebrow growth pattern could provide the precise pathomechanism of eyebrow hypotrichosis leading to a standardized treatment protocol. K E Y W O R D S bimatoprost, eyebrow alopecia, eyebrow loss, loss of lateral third of eyebrows, madarosis | 1405 SUCHONWANIT ANd THAMMARUCHA How to cite this article: Suchonwanit P, Thammarucha S. Eyebrow growth pattern analysis in patients with eyebrow hypotrichosis after receiving topical treatment: A retrospective study.

Frontal–Temporal Triangle Area Hair for Eyebrow Restoration in Asians: A Comparative Study With Periauricular and Occipital Hair

“…10,11 However, the diameter of POA hair is greater than that of eyebrow hair. 18 The present study showed that the FTTA hair was significantly thinner than the POA hair, with an average diameter of 67.02 6 11.94 mm. The hair growth rate was another factor affecting patient satisfaction.…”

Acquired causes of eyebrow and eyelash loss: A review and approach to diagnosis and treatment

“…In contrast, approximately 10% of eyebrow hairs are in anagen with a shorter duration of 2-3 months. 3,4 The upper and lower eyelashes have approximately 41% and 15% hairs in anagen, respectively, ranging between 4 and 10 weeks duration. [5][6][7][8] The growth rate of eyebrow and eyelash hair is 0.12-0.15 mm/ day compared with 0.3-0.4 mm/day for scalp hairs.…”

“…The tail segment has thinner hairs and lower hair density, suggesting that these hairs have the shortest anagen and the lowest follicular stem cell proliferation. 4 This may explain why the lateral third of the eyebrow is most vulnerable to clinically apparent hair loss in several conditions. Each follicular unit of the eyebrow contains a single terminal hair, which differs from scalp follicular units with three to four terminal hairs.…”

“…Hairs in the head segment adopt predominantly vertical orientation compared with oblique hairs of the body and tail. The tail segment has thinner hairs and lower hair density, suggesting that these hairs have the shortest anagen and the lowest follicular stem cell proliferation 4 . This may explain why the lateral third of the eyebrow is most vulnerable to clinically apparent hair loss in several conditions.…”

“…On the scalp, approximately 90% of hairs are in anagen, which lasts for 2–5 years. In contrast, approximately 10% of eyebrow hairs are in anagen with a shorter duration of 2–3 months 3,4 . The upper and lower eyelashes have approximately 41% and 15% hairs in anagen, respectively, ranging between 4 and 10 weeks duration 5–8 .…”