Are blisters on the lips the same as oral ulcers?

Lip blisters are not necessarily oral ulcers, although the two conditions can sometimes be related. Lip blisters may be caused by various factors, including but not limited to internal heat ("shang huo"), dyshidrotic eczema, herpes labialis (cold sores), thermal burns, or food poisoning. When the body's immunity is weakened or oral hygiene is poor, the herpes virus may infect the lips, leading to herpes labialis and resulting in clusters of small blisters. Oral ulcers, on the other hand, typically present as localized defects in the oral mucosa, forming round or oval-shaped erosions covered with a white or yellow pseudomembrane, accompanied by noticeable pain. Although lip blisters and oral ulcers differ in symptoms, both may be associated with immune factors, nutritional deficiencies, or genetic predisposition. When lip blisters occur, it is recommended to seek proper diagnosis based on specific circumstances and take appropriate treatment measures accordingly.