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    Did you mean Allergic Reactions?
    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 10 of 1000+

    1. New Aspects of Langerhans' Cell Function International Journal of Dermatology · 1980 · 57 citations
    2. 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
    3. 83 Transcriptomic meta-analysis and deconvolution approaches unveil cellular dynamics in scarring and non-scarring primary lymphocytic alopecias Journal of Investigative Dermatology · 2023
    4. Lymphocytic Mural Folliculitis Resembling Epitheliotropic Lymphoma in Tigers (<i>Panthera tigris</i>) Veterinary Pathology · 2018
    5. Exosome-Based Therapies in Dermatology: A Scoping Review Journal of Drugs in Dermatology · 2026
    6. Effects of Visible Light on the Skin<sup>†</sup> Photochemistry and Photobiology · 2008 · 195 citations
    7. Current applications of high-frequency ultrasonography in dermatology Postępy Dermatologii i Alergologii · 2017 · 65 citations
    8. Mucocutaneous side effects of antineoplastic chemotherapy Expert opinion on drug safety · 2004 · 55 citations
    9. Morphological characteristics and notes of the skin in preclinical toxicity assessment Journal of toxicologic pathology · 2022 · 2 citations
    10. Exploring the Efficacy and Potential Mechanisms of Topical Periplaneta americana (L.) Extract in Treating Androgenetic Alopecia in a Mouse Model: A Systems Pharmacology and Skin Microbiome Analysis Biology · 2025
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    Learn 2 of 7

    1. Microneedling Technique that makes tiny punctures in the scalp with fine needles
    2. Neem Oil Oil from the neem tree, used in traditional remedies
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    Community 10 of 24

    1. Allergic to minoxidil, are there any alternatives? Reddit · 24 Sept 2025
    2. Just a tad bit swollen but anything for hair right babe? Reddit · 22 Jan 2026
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    4. Infection from micro needling even with medicated shampoos and sanitation Reddit · 20 Apr 2025
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    7. Hair Oils can be DANGEROUS and this is a case study. He lost all his hair. Reddit · 8 Oct 2024
    8. lost all my gains switching from liquid to foam Reddit · 3 Apr 2019
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