[Localized bullous eruption after intravenous injection of aciclovir: toxic or immunoallergic mechanism?].

Objective: To report a case of bullous eruption at and far from the site of aciclovir injection.
Case Report: A 50-year-old man was treated with intravenous aciclovir for Herpes simplex meningoencephalitis. Ten days after treatment onset, blisters appeared on his right forearm, at and far from the site of aciclovir injection.
Discussion: This adverse effect has not been frequently reported. To date, bullous eruptions were considered to result from extravasation of the aciclovir solution. In this case, an immunoallergic pattern was discussed with the presence of a histological leukocytoclastic vasculitis.