Thank you for clarifying...
Lymph nodes can become swollen for many reasons--dental infections, minute sores or cuts in the mouth, viral
infections are common reasons. Lymph nodes can also become infected themselves. They become painful when enlarged due to stretching of the fibrous capsule that surrounds them.
If the node is larger than 1 cm and tender, it is possible that the node itself is infected.
Or, it may be responding to an unknown infection that you are not aware of...
I recommend applying a warm compress to the area, taking ibuprofen and seeing your doctor today.
Your doctor may treat you with antibiotics if no other cause for the enlargement can be seen. A blood count may also be done.
I hope that you feel better soon.
Feel free to ask any follow up questions you may have and I will be happy to answer them for you,
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