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Type IV hypersensitivity is delayed T-cell mediated; contact dermatitis; PPD skin test; granuloma.
Erythema/induration 24-72 h after exposure; eczema; contact dermatitis
T-cell mediated; hapten skin sensitization.
Avoid allergen; topical steroids; antihistamines
Dermatology / allergy.
Warm reminder: Health education reference only; seek care at regular hospital.
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