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*Usually involves [[Type IV Hypersensitivity|Type IV reaction]] not just [[Contact Dermatitis|contact dermatitis]]
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#redirect[[Contact Dermatitis]]
*Pruritic lesions with self-inflicted trauma
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*At areas in contact with allergen
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*Grossly:
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**Erythema, papules, +/- vesicles, exudation -> crusts
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**If chronic, lichenification, hyperpigmentation, alopecia
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*Microscopically:
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**Spongiotic superficial perivascular dermatitis
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**Mononuclear cells
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**If chronic, epidermal hyperplasia
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**May involve [[Eosinophils|eosinophils]]
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[[Category:Type IV Hypersensitivity Diseases]]
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[[Category:Integumentary System - Hypersensitivity Reactions]]
 
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