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Research

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research Black hair dye dermatitis: Still a major skin problem and commonly mimicking chronic actinic dermatitis

July 2026 in “Our Dermatology Online”

This study observed a significant rise and fall in black hair dye dermatitis cases over six years, primarily affecting middle-aged men, with most cases presenting as chronic pigmented lichenoid photodermatitis.

research Patch tests with commercial hair dye products in patients with allergic contact dermatitis to para-phenylenediamine

6 citations , January 2016 in “Indian Journal of Dermatology Venereology and Leprology”

This study found that the majority of "hypoallergenic" hair dyes still triggered allergic reactions in patients sensitive to para-phenylenediamine.

research Alopecia areata after severe allergic contact dermatitis to a permanent hair dye

August 2022 in “Contact dermatitis”

This case report describes a 24-year-old male who developed alopecia areata following an allergic reaction to a permanent hair dye, possibly linked to previous sensitization from a henna tattoo.

research A clinical evaluation of a permanent hair dye designed to reduce allergic contact dermatitis and hair damage

9 citations , July 2022 in “Journal of Cosmetic Dermatology”

In this study, an ammonia-free and PPD-free permanent hair dye was tested on 50 ethnically diverse females, showing no cases of contact dermatitis and significant improvements in hair shine, color, moisturization, porosity, and combability after two dyeing sessions.

research Hydrogen peroxide and monoethanolamine are the key causative ingredients for hair dye-induced dermatitis and hair loss

34 citations , January 2012 in “Journal of Dermatological Science”

In this mouse study, researchers found that hydrogen peroxide and monoethanolamine in hair dyes may be key contributors to dermatitis and hair loss due to oxidative stress.

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Community Join

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community Hair loss is holding me back from enjoying life and I'm wasting away my youth

279 upvotes 5 months ago

A 31-year-old man feels depressed due to hair loss, using topical finasteride and previously tried minoxidil. Others suggest treatments like finasteride, minoxidil, hair transplants, or embracing baldness, highlighting the importance of mental health and self-acceptance.

community 22 | ~34 Months Finasteride Update

820 upvotes 2 years ago

A user shared their 34-month update on using finasteride for hair loss, noting they maintained regrowth even after stopping minoxidil a year ago. Other users shared similar experiences and expressed admiration for the results.

community Those that apply minoxidil twice a day

in Chat 71 upvotes 1 year ago

Minoxidil is typically applied once daily, with some users opting for foam to minimize irritation. Users often combine it with finasteride or use oral minoxidil for improved results, while managing scalp irritation with ketoconazole or salicylic acid shampoos.

community Fighting Hair loss AND Grey Hair

2 upvotes 4 years ago

OP is exploring ways to stop or reverse greying hair, using NAC and considering PABA supplements. Some users suggest hair dye, black strap molasses, and copper as potential solutions.

community Please advise those who have succeeded in reversing their hair color from white to black

5 upvotes 2 years ago

A 25-year-old male seeks advice on reversing white hair to black. Suggestions include using hair dye, peptides like TB-500 and BPC-157, and finasteride for hair growth.

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Learn

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learn Hair Transplant

Can I dye my hair after a hair transplant? Wait 4-6 weeks before dyeing your hair after a hair transplant.
Can I style or care for my transplanted beard after the hair transplant? You can style and care for your transplanted beard like natural hair after it heals.
When can I cut or style my hair after a hair transplant? You can cut or style your hair about 1 month after a hair transplant.
All 4 questions on Hair Transplant →

learn Scalp Micropigmentation

Can I still color or style my hair after scalp micropigmentation? You can color and style your hair after scalp micropigmentation once fully healed.

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Clinics

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All 12 clinic results →

Experts

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Unscored
SMP Specialist
Hairo Fallas
Newark, NJ, United States

Hairo Fallas