title: Conctact dermatitis: some important topics.
abstract: Allergic contact dermatitis (ACD) is a type IV delayed hypersensitivity reaction. The gold standard for diagnosis is patch testing. The prevalence of positive patch tests in referred patients with suspected ACD ranges from 27 to 95.6%. The relationship between ACD and atopic dermatitis (AD) is complicated with conflicting reports of prevalence in the literature; however, in a patient with dermatitis not responding to traditional therapies, or with new areas of involvement, ACD should be considered as part of the work-up.
authors.affiliation: Department of Biomedical, Surgical and Odontoiatric Sciences, University of Milan and Ospedale Galeazzi. Ospedale Galeazzi, Via Galeazzi 4, 20161 Milano, Italy. E-mail: paolo.pigatto@unimi.it.
authors.forename: P D
authors.initials: PD
authors.lastname: Pigatto
mesh_terms: D003877:Dermatitis, Contact / Q000175:diagnosis / Q000453:epidemiology / Q000276:immunology / Q000628:therapy; D006801:Humans; D010328:Patch Tests; D011237:Predictive Value of Tests; D011379:Prognosis; D012307:Risk Factors
keywords: Contact dermatitis; allergy irritancy; patch test