White oral ulcer

Some patients with oral ulcers notice that, after the condition has progressed for a period of time, the ulcer site turns white. Unfamiliar with the clinical significance of this whitening, they wonder: “What does the white appearance in oral ulcers indicate?”

White Appearance in Oral Ulcers

The white layer observed on oral ulcers is a pseudomembrane—a composite formed by ulcer exudate, food debris, and saliva. This pseudomembrane should not be forcibly removed. Instead, topical application of iodophor-based antiseptics or traditional Chinese medicine (TCM) powders—such as Xilei San (a TCM formulation containing synthetic bezoar, borneol, and other ingredients) or Yinshengji San (a TCM wound-healing powder)—is recommended. This condition primarily results from mucosal microcirculatory disturbances, metabolic dysfunction, and compromised immunity, leading to dysbiosis of the oral microbiota. Under these conditions, pathogenic bacteria and viruses can readily invade and proliferate, thereby triggering ulcer formation.

At this stage, a pseudomembrane has already formed, indicating entry into the healing phase. During this period, meticulous oral hygiene is essential, and dietary precautions are equally important: avoid excessively spicy, hot, or hard foods, as these may dislodge the superficial white pseudomembrane and delay ulcer healing. During recovery, patients should also avoid raw, cold, or otherwise irritating foods, and instead consume more vegetables and fruits that are easy to digest and absorb.

The above medications are provided for reference only. Specific drug use must be guided by a qualified physician. If any discomfort or abnormal symptoms arise, prompt medical evaluation at a hospital is strongly advised, and appropriate management should be performed under the supervision of a professional healthcare provider. We hope this information proves helpful to you!