Value of photo assessment in late patch test readings—A multicenter study from six European patch test clinics

It is recommended that patch test readings include a day (D)7 reading. Substitution of the D7 reading with a photo may be a valid option.To compare the sensitivity of digital photos at D7 to clinical readings, to assess the number of positive reactions appearing at D7 only (late reactions), and after D7 only (delayed reactions).Patients patch tested in six European clinics were instructed to forward photos of the patch test reactions to the...