A herpetic ulcer is seen microscopically to have a sharp margin. The ulcer base at the left shows loss of overlying squamous epithelium with only necrotic debris remaining.

• 显微镜下可见单纯疱疹性溃疡有一个锐利的边缘。左侧溃疡底部没有鳞状上皮的覆盖,仅见坏死组织的碎片。