The insurance claim explained that the worker's burn began to ulcerate after two weeks.

保險理賠文件說明，該員工的燒傷在兩週後開始潰爛。

Our clinic emailed the patient instructions to keep the wound clean so it would not ulcerate.

我們診所寄電子郵件給病患，提醒保持傷口清潔以免潰爛。

The pharmaceutical sales rep said the new cream helps stop small cuts from ulcerating.

藥廠業務代表表示，這款新藥膏有助於防止小傷口潰爛。