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Comparison of irritant and allergic dermatitis

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

primary irritant

allergic contact

Prior exposure

none required

sensitisation needed to substance

Spread

little extension from contact site

may spread to sites not in direct contact

Association

atopy predisposes

prolonged use of topical medicaments may predispose

Susceptibility

everyone

only certain people

Course

Rapid onset within 4-12 hours. Lesions develop on first exposure

Onset usually after 24 hours. No lesions on first exposure.

 


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