[Localized recurrent light-induced Darier disease following Blaschko lines].

INTRODUCTION: Occurrence of localized Darier's disease was discussed. We report one case of photo-induced and localized Darier. CASE REPORT: Our patient had had a linear eruption every summer for ten years. Clinical and photological examinations showed an acantholytic dyskeratosis as well as Darier's disease. Lesions were reproduced during photobiological examinations by UVB phototests. DISCUSSION: Several diagnoses could have been considered: Darier's disease or acantholytic dyskeratosis dermatosis as Grover's disease or Hailey-Hailey's disease or acantholytic dyskeratosis nevus. Clinical features and linear eruption following Blaschko's lines pleads for cutaneous mosaicism of Darier's disease. Photobiological explorations and literature data shows that UVB photo-induced lesions are different from isomorphic response of Koebner after irritant application.