Contact sensitivity and atopic dermatitis: association with prognosis, a follow-up study in 801 atopic patients.

The influence of contact sensitivities on the course of atopic dermatitis (AD) is not known. The objective of the study is to find the course of AD in atopic patients with and without contact sensitivities. A total of 801 atopic patients were studied and patch tested in 1983/84. A questionnaire focusing on the occurrence of dermatitis was sent to these patients 16 years later. During the follow up the number of symptom-free patients increased from 36.7% to 40.7%. In patients with positive patch-test reactions, 30.1% were symptom free in 1983/84 and 38.3% at the follow up (P= 0.001). Among those with positive patch-test reactions to fragrance mix and/or balsam of Peru, the number of symptom-free patients had increased the most: from 26.9% to 42.6% (P= 0.0095), and a similar tendency was seen among those with nickel allergy. The occurrence of dermatitis did not change among patients without contact sensitivities. Thus, the study concluded that contact allergy does not impair the prognosis of dermatitis in atopic patients.