As a teenage girl I used to get canker sores very often and with it a swolen gland. Suffered pretty much until a doctor suggested I check my wisdom teeth. Dentist said one tooth had infection. Which caused canker sores and swolen glands. My wisdom teeth were taken out and after that I didn't get the canker sores anymore. Now I get them very rarely and taking vitamin B comlex helps me. Let me know if this helps you. Good Luck!