Search
for

    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.

    Related Terms

    Research 10 of 1000+

    1. 55 cases of allergic reactions to hair dye: a descriptive, consumer complaint‐based study Contact Dermatitis · 2002 · 98 citations
    2. Contact dermatitis in reaction to 2% topical minoxidil solution Journal of The American Academy of Dermatology · 1991 · 23 citations
    3. Hypersensitivity Reactions to Homemade Topical Preparations. PubMed · 2023
    4. Allergic contact dermatitis to natural products Journal of The American Academy of Dermatology · 2017
    5. Spectrum of Mucocutaneous Reactions to COVID-19 Vaccination: A Report from a Web-Based Study from India. PubMed · 2022 · 2 citations
    6. DERMATOLOGICAL AND SYSTEMIC REACTIONS TO HAIR DYES: CURRENT EVIDENCE AND MANAGEMENT International Journal of Applied Pharmaceutics · 2026
    7. Psoriatic Alopecia/Alopecia Areata–Like Reactions Secondary to Anti–Tumor Necrosis Factor-α Therapy: A Novel Cause of Noncicatricial Alopecia The American Journal of Dermatopathology · 2011 · 72 citations
    8. Cutaneous adverse drug reaction associated with topical use of benzyl benzoate in a dog Ciência Rural · 2025
    9. <i>Malassezia</i> spp. overgrowth in allergic cats Veterinary dermatology · 2007 · 53 citations
    10. Harmless Herbs? A Review of the Recent Literature The American Journal of Medicine · 1998 · 581 citations
    All research results →

    Community 10 of 24

    1. Allergic to minoxidil, are there any alternatives? Reddit · 24 Sept 2025
    2. Bee venom better than minoxidil? Reddit · 1 Dec 2025
    3. Hair Oils can be DANGEROUS and this is a case study. He lost all his hair. Reddit · 8 Oct 2024
    4. lost all my gains switching from liquid to foam Reddit · 3 Apr 2019
    5. Just a tad bit swollen but anything for hair right babe? Reddit · 22 Jan 2026
    6. Huge anxiety after taking finasteride Reddit · 5 Dec 2025
    7. Infection from micro needling even with medicated shampoos and sanitation Reddit · 20 Apr 2025
    8. Latanoprost shed - anyone have experience? Reddit · 25 Aug 2021
    9. Looks like I’m allergic to propylene glycol.. Reddit · 11 May 2022
    10. Hair transplant histamine issues (could be antibiotics taken during transplant!?) Reddit · 9 Dec 2023
    All community results →

    Learn 3 of 7

    1. Microneedling Technique that makes tiny punctures in the scalp with fine needles
    2. Scalp Micropigmentation scalp tattoos to mimic the appearance of light stubble
    3. Neem Oil Oil from the neem tree, used in traditional remedies
    All learn results →