As an STD assistant, I can explain that herpes simplex virus type 1 (HSV-1), which commonly causes oral herpes, can infect the mouth and lips. While cold sores on the lips are the most common manifestation, the virus can also cause sores or lesions on the gums, tongue, and inside of the cheeks. It's important to consult a healthcare professional for an accurate diagnosis and appropriate treatment if you experience any unusual sores or lesions in your mouth. They can provide personalized guidance based on your specific situation. Please feel free to reach out if you have any other questions or concerns related to STDs.