Reading of Patchtest Reactions

  • Eustachio NettisEmail author
  • Caterina Foti
  • Daniele Paolo Pigatto
  • Alberico Motolese
  • Gianni Angelini


The scrupulous reading of the patch test reactions must be made by using a magnifying glass, carrying out digital palpation, and assessing symptoms. Allergic test reaction is characterized by itching, erythema, papules, and vesicles; generally there is also a reaction outside the area where the test substance has been applied. After making qualitative-quantitative assessment, positive reactions are classified according to well-established criteria. Positive allergic reactions must be differentiated from false-positive results. The possibility of false-negative results and mixed (irritant and allergic) and doubtful reactions must be considered. Patch and photopatch testing can involve some side effects.


Reading of patch tests Qualitative-quantitative assessment Allergic reaction False-negative reactions False-positive reactions Photopatch tests 

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© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Eustachio Nettis
    • 1
    Email author
  • Caterina Foti
    • 2
  • Daniele Paolo Pigatto
    • 3
  • Alberico Motolese
    • 4
  • Gianni Angelini
    • 5
  1. 1.Department of Emergency and Organ TransplantationUniversity of Bari “Aldo Moro”BariItaly
  2. 2.Department of Biomedical Science and Human OncologyUniversity of Bari “Aldo Moro”BariItaly
  3. 3.Department of Medical, Surgical and Dental Biosciences, Galeazzi HospitalUniversity of MilanMilanItaly
  4. 4.Department of DermatologyMacchi HospitalVareseItaly
  5. 5.DermatologyUniversity of Bari “Aldo Moro”BariItaly

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