Jiēchùxìng píyán shì diǎnxíng de chífāxíngbiàntàifǎnyìng.
Contact dermatitis is a typical delayed-type hypersensitivity reaction.
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In immunology 变态反应 means 'hypersensitivity / allergic reaction' — not 'abnormal reaction' in the everyday sense. 迟发型 (delayed) distinguishes it from 速发型 (immediate, IgE-mediated) reactions; it peaks 24–72 hours after exposure and is T-cell mediated.
