Hypertrichosis Induced by Minoxidil: A Case of Systemic Absorption from Scalp Occlusion

April 2025 in “ American Journal of Case Reports ”

M. Majzoub, Vivien Moris

minoxidil hypertrichosis systemic absorption scalp occlusion androgenetic alopecia traction alopecia platelet-rich plasma LED treatment laser hair removal Rogaine PRP LED therapy

From the encyclopedia

Minoxidil →

An essential vasodilator with some anti-androgenic effects

Platelet-Rich Plasma →

growth factors taken from your blood and injected into your scalp to stimulate hair

Studysummary This case report highlights that improper application techniques, such as scalp occlusion, can increase systemic absorption of minoxidil and lead to unwanted side effects like hypertrichosis.

Our plain-language summary. Not medical advice or a treatment recommendation. Consult a qualified healthcare professional before changing treatment. Full disclaimer

This case report highlights the risk of systemic absorption and hypertrichosis from improper use of topical minoxidil, particularly when combined with scalp occlusion. A 28-year-old woman with androgenetic and traction alopecia experienced excessive hair growth on her face, arms, and legs after using 5% minoxidil spray, PRP therapy, and LED treatment. Her use of a wig and tight night cap likely increased minoxidil absorption. Discontinuation of minoxidil and laser hair removal resolved the hypertrichosis. The study emphasizes the need for proper patient education on minoxidil application to prevent adverse effects and suggests further research on absorption-enhancing factors.

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Research cited in this study

11 / 11 results

research A Child with Generalized Hypertrichosis Due to Secondary Topical Minoxidil Exposure

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Randomized Placebo-Controlled, Double-Blind, Half-Head Study to Assess the Efficacy of Platelet-Rich Plasma on the Treatment of Androgenetic Alopecia

research Randomized Placebo-Controlled, Double-Blind, Half-Head Study to Assess the Efficacy of Platelet-Rich Plasma on the Treatment of Androgenetic Alopecia

136 citations , April 2016 in “Dermatologic Surgery”

This study found that platelet-rich plasma significantly increased hair density and anagen hair proportions in androgenetic alopecia patients, suggesting potential as an adjuvant therapy.

research Minoxidil Use in Dermatology, Side Effects, and Recent Patents

152 citations , April 2012 in “Recent Patents on Inflammation & Allergy Drug Discovery”

This review describes minoxidil's hair regrowth mechanism and discusses dermatological applications, but reports no new clinical results, emphasizing the need for regular use and addressing allergic reactions.

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102 citations , February 2008 in “The FASEB Journal”

This study found that human hair follicles express ATP-sensitive potassium channels, suggesting that minoxidil acts on these channels and that drugs targeting them may treat hair disorders.

research The Diagnosis and Treatment of Iron Deficiency and Its Potential Relationship to Hair Loss

207 citations , April 2006 in “Journal of The American Academy of Dermatology”

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research Minoxidil: Mechanisms of Action on Hair Growth

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research Androgenetic Alopecia in Women

139 citations , June 2003 in “Journal of Investigative Dermatology Symposium Proceedings”

This article reviews androgenetic alopecia in women, highlighting diagnosis criteria and noting that topical minoxidil is currently the only proven treatment for hair growth; it reports no clinical trial findings.

research Hypertrichosis in Females Applying Minoxidil Topical Solution and in Normal Controls

63 citations , April 2003 in “Journal of The European Academy of Dermatology and Venereology”

This study found that minoxidil topical solution was associated with a dose-related occurrence of hypertrichosis, especially facial hair, in women treated for androgenetic alopecia.

research Alopecia in Women: A 2003 Review

18 citations , March 2003 in “PubMed”

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