Excited skin syndrome

Abstract

Background: Excited skin syndrome (ESS) occurs when, after a battery of patch tests is applied to patients with suspect allergic contact dermatitis, an excessive number of positive patch tests is obtained that are no longer reproduced when the patient is retested. Objective: This study was performed to verify the occurence of ESS when patch tests were applied to a population with a hypothetical diagnosis of allergic contact dermatitis, to determine the rate of positive test result loss among the tested patients who developed ESS, and to try to identify factors that might initiate the ESS. Methods: From January 1985 to May 1990, patch tests were performed on 1,500 patients referred to the Allergy Sector of the Dermatology Clinic of Santa Casa de São Paulo with a hypothetical diagnosis of contact dermatitis. Thirty-four of the 1,500 patients were considered because they showed three or more positive test results during the first phase of the patch tests. These patients were submitted to the retesting of substances with positive test results in the first phase. Results and Conclusions: Analysis of the results allowed us to conclude that the frequency of ESS in the 1,500 patients tested was 2.2% and that the number of lost test results between the first and the second phase was 175, showing a loss rate of positive test results of 63.5%. Regarding the facts that might interfere with the ESS, it was shown that (1) the loss rate of positive test results varied among patients, ie, polysensitized patients showed a lower rate of test result losses than monosensitized or bisensitized patients; (2) the longer the time of evolution of the chronic eczematous dermatitis, the higher the tendency to develop ESS; (3) ESS might be initiated by positive test results of weak, medium, or high intensity; (4) when the patch tests are applied close to one another, the positive test results may induce additional responses in the area; and (5) it was not possible to show statistically that the nature of certain substances interferes with the induction of ESS.