The Hidden Risk of Increased Hair Density After Laser Hair Removal for Men

Understanding Paradoxical Hypertrichosis in Men

In a groundbreaking study conducted by Dr. Sho Moriguchi of the Crest Skin Clinic, the phenomenon known as Paradoxical Hypertrichosis (PH) has been shown to be substantially more prevalent in males than in females following laser hair removal procedures. Traditionally viewed as a rare side effect, this study uncovers that approximately one-third of male patients experienced increased hair density after the treatment, a stark contrast to just 9% of women.

What is Paradoxical Hypertrichosis?

Paradoxical Hypertrichosis refers to the unexpected growth of coarse hair, particularly around the treated area, after undergoing laser or light hair removal. While past estimates suggested that the occurrence rate varies between 0.6% and 10%, most of these figures stemmed from studies focused primarily on female subjects, necessitating a deeper examination of gender differences.

Study Findings

In this recent research, conducted from March 2022 to January 2024, a total of 318 patients were evaluated (63 males and 255 females). The laser treatment involved the use of GentleMax Pro, a standard device with dual wavelengths (Alexandrite 755nm and YAG 1064nm) for hair removal. Findings indicated that 33.3% of male patients experienced PH compared to only 9.0% of females, marking a statistically significant difference (p<0.05).

Furthermore, the incidence of PH was notably higher for males across multiple body areas, with 17.4% of males developing the condition in various regions compared to just 1.6% of females. Areas such as the back and arms in males showed higher rates of hair density increase, contradicting previous beliefs that such cases were predominantly confined to facial regions in women.

The Implications for Male Patients

This significant discrepancy emphasizes the importance of patient education regarding potential side effects, especially as more men seek hair removal for cosmetic purposes. The booming market for male grooming services has seen a surge in clinics, often leading to varying degrees of expertise and knowledge among practitioners. Therefore, it becomes crucial for patients to be well-informed about the risks associated with laser hair removal.

Dr. Moriguchi states, "Men tend to have a higher frequency of PH than previously thought. With the rising number of men pursuing aesthetic treatments, it is essential for them to understand these risks. Proper consultation and discourse about potential outcomes should be a priority for professionals in the field. While boosting hair density is an adverse event, it is reversible with the appropriate follow-up treatments."

Cautious Approach to Laser Hair Removal

As the hair removal industry expands rapidly, price competition often undermines the quality of services rendered. Patients must recognize that hair removal is no longer merely a cosmetic procedure but is now considered a medical intervention that requires specialized knowledge and ongoing support.

The Crest Skin Clinic is committed to advancing research on the mechanisms and preventive measures associated with adverse reactions in hair removal. Their goal is to foster safer practices and more reliable outcomes for patients undergoing these procedures.

Concluding Thoughts

This study represents the first comprehensive analysis highlighting the disparity between male and female patients regarding paradoxical hypertrichosis. Ensuring that clinics maintain a standardized level of care and information dissemination is paramount. With scientific data supporting these findings, the medical community must prioritize transparency and informed consent among patients, particularly men who are at a higher risk.
In addressing the concern of increased hair density after laser treatment, practitioners may consider optimizing settings for various body areas and exploring alternative treatments to mitigate risks. The landscape of hair removal is evolving, and ongoing research is vital for improving safety and efficacy standards in the realm of dermatological care.

Publication Details

Title of the Study: Gender Disparities in Paradoxical Hypertrichosis After Laser Hair Removal
Published in: Journal of Cosmetic Dermatology, Wiley Publishing
Lead Author: Dr. Sho Moriguchi, Crest Skin Clinic
Publication Date: April 30, 2025
DOI: 10.1111/jocd.70194

For inquiries or further information, please contact Crest Skin Clinic.
Contact: Maika Hoshino
Phone: 047-406-3754
Email: [email protected]
Crest Skin Clinic Locations:

- Funabashi: 4-41-10 Honcho, Funabashi City, Chiba, SADOYA Up Court 5F
- Ikebukuro: 1-23-3 Higashi Ikebukuro, Toshima, Tokyo, Asline Ikebukuro 4F

Website: Crest Skin Clinic