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Research

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research 55 cases of allergic reactions to hair dye: a descriptive, consumer complaint‐based study

98 citations , November 2002 in “Contact Dermatitis”

This study found that adverse reactions to para-phenylenediamine in hair dye, including severe allergic contact dermatitis, may be more common than currently reported and often misdiagnosed.

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 Patterns of Sensitization and Cross-Reactivity in Hair Dye Allergy: An 18-Year Tertiary-Center Experience from Greece.

February 2026 in “PubMed”

This study reported that para-phenylenediamine and toluene-2,5-diamine are the main sensitizers in hair dye-related allergic contact dermatitis, with significant cross-reactivity to several other compounds.

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.

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Community Join

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community allergen of the year award list(2000-2023).most allergens are in every day shampoos and skin care.

in Research/Science 4 upvotes 3 years ago

The post discusses allergens in everyday shampoos and skincare products, listing yearly allergens from 2000 to 2023. It suggests that these chemicals might contribute to acne and hair loss.

community Bee venom better than minoxidil?

in Research/Science 1061 upvotes 10 months ago

Bee venom at 0.001% concentration was more effective than 2% minoxidil in promoting hair growth in mice, possibly due to increased growth factors and reduced inflammation. Caution is advised due to potential allergic reactions and the reliance on animal data.

community Mesenchymal Stem Cell Therapy (Exosome) Before & After

2 upvotes 2 years ago

A user's father experienced hair regrowth and other health improvements after two IV exosome treatments. The user also had four rounds of exosome therapy, noting significant hair regrowth and relief from headaches, but no change in gray hair.

community Committing to Fin/Min every day for the rest of your life?

in Chat 5 upvotes 6 months ago

Finasteride and minoxidil are effective for hair loss, with many users finding them manageable as part of a daily routine. Costs can be reduced by purchasing generic versions, and while some users express concerns about long-term use, most agree the benefits outweigh the inconvenience.

community Minoxidil 5% ONLY 3month progress

in Progress Pictures 966 upvotes 1 year ago

A 19-year-old saw significant hair regrowth using 5% minoxidil over three months, with only initial shedding as a side effect. They plan to continue minoxidil and may add finasteride to maintain results.

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Learn

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learn Hair Transplant

Can eyebrows be transplanted in a hair transplant procedure? Eyebrow transplants are possible using hair transplant techniques for fuller eyebrows.

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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