Practical Guide to Patch Testing by Eustachio Nettis & Gianni Angelini

Author:Eustachio Nettis & Gianni Angelini
Language: eng
Format: epub
ISBN: 9783030338732
Publisher: Springer International Publishing

3.5 Doubtful Reactions

Doubtful reactions (+?) may consist of a nonhomogeneous or also only a homogeneous erythema (Figs. 3.14 and 3.15). It should be remembered that erythema is in any case a parameter indicating the degree of intensity, which does not allow an allergic-type reaction to be distinguished from an irritant type. In cases of doubtful reactions, characterized by erythema alone, the test must be repeated at a later time. In fact, when repeated, the doubtful reaction could manifest as a “positive allergic reaction.” This occurs more frequently in cases of doubtful reactions characterized by a homogeneous erythema than by a nonhomogeneous reaction.

Fig. 3.14Doubtful reaction: homogeneous erythema

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