What should I do if the corner of my mouth hurts and it also hurts when I open my mouth?

When experiencing pain at the corners of the mouth or pain when opening the mouth, it is important to first identify the underlying cause, which may be related to various factors such as insufficient water intake, angular cheilitis, oral ulcers, allergies, or herpes. 1. Increase fluid intake: If the pain is due to inadequate hydration, increase water consumption appropriately and eat foods with high water content, such as watermelon and apples. 2. Treat angular cheilitis: For pain caused by angular cheilitis, apply medications such as erythromycin ointment or fusidic acid cream to the affected area as directed by a healthcare provider to reduce inflammation and relieve pain. 3. Manage oral ulcers: For pain resulting from oral ulcers, use treatments such as oral ulcer powder or Bingbor powder, and maintain good oral hygiene. 4. Address allergies and herpes: For mouth corner pain caused by allergies or herpes, follow medical advice to use antihistamines or antiviral medications as appropriate. Patients experiencing pain at the corners of the mouth or pain when opening the mouth should take appropriate treatment measures to alleviate discomfort and promote recovery. Seek prompt medical attention if necessary.