What causes blisters at the corners of the mouth?

Blisters at the corners of the mouth, medically known as angular cheilitis or herpes stomatitis, are mainly caused by the following factors:

Viral infection: Herpes simplex virus infection is the most common cause of blisters at the corners of the mouth, especially when immunity is low.

Nutritional deficiencies: A lack of vitamin B2 or elements such as zinc and iron may lead to dryness, cracking, and blistering at the corners of the mouth.

Poor oral hygiene: Long-term oral hygiene problems, such as periodontal disease and oral ulcers, can also cause damage to the skin at the corners of the mouth, leading to infections and blisters.

Dietary habits: Long-term consumption of spicy, greasy, or irritating foods may cause internal heat accumulation, leading to blisters at the corners of the mouth.

Environmental factors: Cold, dry, or humid climates, or prolonged exposure to sunlight, may make the skin vulnerable and prone to inflammation and blistering.

Mechanical injury: Habits such as frequently licking or biting the lips, or using unsuitable cosmetics, may also cause blisters at the corners of the mouth.

Blisters at the corners of the mouth can be caused by various factors; specific causes should be determined based on individual circumstances. It is recommended to maintain good oral hygiene habits and supplement necessary nutrients. If concerns persist, please consult a healthcare professional promptly.