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Glossary Allergic Reactions

immune system overreacts to harmless substances, causing symptoms

An allergic reaction, also known as a hypersensitivity reaction, occurs when the immune system mistakenly identifies a harmless substance (allergen) as a threat and overreacts to it. This can lead to symptoms ranging from mild, such as itching and sneezing, to severe, such as anaphylaxis, which can be life-threatening. Common allergens include pollen, pet dander, certain foods, and insect stings.

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Research

5 / 1000+ results

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 Contact dermatitis in reaction to 2% topical minoxidil solution

23 citations , April 1991 in “Journal of The American Academy of Dermatology”

Minoxidil solution can cause skin irritation and allergies in some users.

Spectrum of Mucocutaneous Reactions to COVID-19 Vaccination: A Report from India

research Spectrum of Mucocutaneous Reactions to COVID-19 Vaccination: A Report from a Web-Based Study from India.

2 citations , March 2022 in “PubMed”

In this study, 19.6% of COVID-19 vaccine recipients reported post-vaccination mucocutaneous effects, mostly mild and self-limiting; the reactions were similarly frequent for Covishield and Covaxin.

research Hypersensitivity Reactions to Homemade Topical Preparations.

December 2023 in “PubMed”

This study highlights that homemade topical herbal preparations, although popular for their perceived safety, may lead to allergic reactions, notably with Mediterranean herbs, and advises cautious use, particularly for allergy-prone individuals.

research Allergic contact dermatitis to natural products

May 2017 in “Journal of The American Academy of Dermatology”

This study found an increase in allergic contact dermatitis cases linked to natural products like propolis and marigold, predominantly affecting women in a Bulgarian population.

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Learn

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learn sh-Polypeptide-7

Are there any safety concerns or allergic reactions associated with sh-Polypeptide-7 in topical hair products? There are no published human studies on sh-Polypeptide-7 itself, so its safety is unestablished; research on cosmetic peptides as a class reports low irritation and rare allergy, and dermatologists advise patch testing a new scalp product.

learn white tea

Are there any side effects or scalp reactions associated with white tea in hair treatments? White tea can cause mild irritation or rare allergic reactions on the scalp.

learn Capixyl

Capixyl: Does it have side effects? Or is it too good to be true? Capixyl may cause mild irritation or allergic reactions in some users.

learn Scalp Micropigmentation

Are the pigments used in scalp micropigmentation safe? Providers describe SMP pigments as safe, medical-grade and made for the scalp, but those are supplier and clinic descriptions rather than regulatory approvals: no colour additive is approved for injection into the skin, and allergic reactions to tattoo pigment are documented.

learn Microneedling

technique to create small wounds in skin to activate collagen production and hair growth

learn Vascular Endothelial Growth Factor

learn Neem Oil

natural substance from Neem tree with medicinal and pesticidal properties

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Community Join

5 / 194 results

community Looks like I’m allergic to propylene glycol..

4 upvotes 4 years ago

The user is experiencing an allergic reaction to propylene glycol in Kirkland minoxidil and is considering switching to a foam version or a low-PG minoxidil solution. They are also contemplating oral minoxidil but are concerned about its long-term safety.

community Hair transplant histamine issues (could be antibiotics taken during transplant!?)

1 upvotes 2 years ago

User experienced severe allergic reactions and liver issues after a hair transplant, likely due to antibiotics and medications. Despite trying Minoxidil, the user faced further complications and is now seeking medical advice for potential future transplants.

community Hair Oils can be DANGEROUS and this is a case study. He lost all his hair.

in Treatment 7 upvotes 1 year ago

Hair oils can cause severe allergic reactions, as seen in Jermel Brown's case, leading to significant health issues and legal action for damages. Users discussed concerns about various hair oils, including Mielle and Kiehl's, with some experiencing hair loss and others using treatments like Minoxidil and Finasteride to address damage.

community Just a tad bit swollen but anything for hair right babe?

in Transplants 516 upvotes 7 months ago

A user experienced significant swelling after a hair and beard transplant, possibly due to an allergic reaction or improper post-surgery care. Despite dissatisfaction with the clinic's handling of grafts and customer service, the user appreciates the clinic's skill in achieving natural hairline density.

community lost all my gains switching from liquid to foam

4 upvotes 7 years ago

Switching from liquid to foam minoxidil led to hair loss for OP, possibly due to a second shedding cycle. OP experienced allergic reactions to propylene glycol in the liquid form, causing dandruff and itchiness, which improved after switching to foam.

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