I'm pretty sure that's what I've got and it's bloody agony 
On Monday I had a mild kind of bruised feeling under the back of my tongue on the left, but on the outside iykwim? Sort of to the inner right of my left lower jaw.
It's been there on and off ever since and I seem to have more saliva than usual. It aches when I swallow and move my tongue.
After lots of googling the location of the pain, it seems to be the submandibular salivary gland area.
Just wondered if anyone has had similar, and knows if I need to bother the Gp with it or if it will clear up on its own?