[Patch testing increases the likelihood of recognizing lamotrigine as a cause of drug-induced rash].

autoimmune diseases.2 The course of this disease is selflimiting. The lesions resolve within 2 to 4 weeks without residual scarring or recurrence.1 Although its etiology is unknown, the development of this disease is associated with various viral infections, the most common of which is Epstein-Barr virus.1,3-9 The case reported here involved acute ulceration of the vulva (Lipschütz ulcers), associated with primary influenza A virus infection. Because of the high incidence of infection by this virus and the great public alarm regarding the H1N1 serotype, we believe that it is important to study acute ulceration of the vulva and its relationship with influenza A virus infection.10