July 2014 in “Elsevier eBooks” The document concludes that various hypersensitivity diseases in horses can be diagnosed and treated with methods like immunotherapy and medication, and early aggressive treatment is crucial for severe diseases like equine cutaneous pythiosis.
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.
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May 1980 in “International Journal of Dermatology” Langerhans cells are crucial for skin immunity and allergic reactions.
February 2026 in “Indian Journal of Dermatology” This study from a dermatology department found that patch test positivity for allergic contact dermatitis is lower in geriatric patients than in adults, likely due to age-related immune changes and reduced allergen exposure.
March 2026 in “Indian Dermatology Online Journal” This report details a case study where a 40-year-old woman experienced allergic contact dermatitis and angioedema-like symptoms after using PPD-containing hair dye. Patch testing confirmed a positive reaction to PPD, highlighting the substance's potential to cause both T-cell and IgE-mediated hypersensitivity reactions.