It's possible that you might be describing a vivid dream or a hallucination, especially if you were in a state of sleep or waking up from sleep when this occurred.
If you are experiencing strange or unusual sensations or visions, it's essential to consider the possibility of sleep disorders, such as sleep paralysis or hypnagogic hallucinations. Sleep paralysis can cause a person to be temporarily unable to move or speak while transitioning between sleep and wakefulness and might be accompanied by vivid hallucinations.
However, if you are certain that you are awake and still experiencing these sensations or if you have any other concerning symptoms, it's crucial to seek immediate medical attention. Unusual or persistent sensations in the mouth or elsewhere in the body may be a sign of an underlying medical condition that requires evaluation by a healthcare professional.
In any case, if you are concerned about your health or experiencing distressing symptoms, please consult a medical professional for a proper evaluation and guidance. They will be able to provide you with an accurate diagnosis and appropriate treatment if necessary.