Bilateral herpetic keratitis has been reported in patients with atopy, measles, graft-versus-host disease, and altered immune status. We report a serologically verified case of primary, simultaneous onset, bilateral, atypical epithelial herpetic keratitis that manifested as dendriform epithelial edema during a generalized dermatitis incident. A 37-year-old man with chronic atopic dermatitis developed Kaposi's varicelliform eruption and bilateral dendritic epithelial keratitis with corneal epithelial edema. The pathogens isolated from both eyes were identified as herpes simplex virus type 1 (HSV-1) by a direct immunofluorescence method. Serological tests obtained on three different occasions over a 5-week period verified a primary HSV infection. With serological verification, we report a rare case of primary, simultaneous onset, bilateral, dendritic epithelial keratitis at a very early stage with complications of generalized herpetic disease in a patient with atopic dermatitis.