hey my daughter is 4 and has a tooth coming (where adults get there wisdom tooth) she also has a swollen gland on this side. I thouth the worse that she had cancer but had her at the ENT and he said he thinks it the tooth.
When my lower wisdom tooth and surrounding gum was sore a few years ago I had swollen glands and a sore throat on the same side. I found ibuprofen worked best as it's an anti-inflammatory. Make sure you have something to eat before you take it though(even just a biscuit or piece of fruit)because taken on an empty stomach it can damage your stomach lining.