Who am I? My cause is unknown.|T=Canker sore|Angina|Cellulitis|Delirium|Pneumonia|Acne
I occur in women more often than men.|T=Canker sore|Angina|Cellulitis|Delirium|Pneumonia|Acne
I usually first appear between the ages of 10 and 40.|T=Canker sore|Angina|Cellulitis|Delirium|Pneumonia|Acne
I am a benign open sore in the mouth.|T=Canker sore|Angina|Cellulitis|Delirium|Pneumonia|Acne
I usually appear in the inner surface of the cheeks or lips.|T=Canker sore|Angina|Cellulitis|Delirium|Pneumonia|Acne