You won't see your doctor, you'd see a dentist. Chances are it's a blocked saliva gland.  Try that lemon stuff you get in those wee plastic bottles. Don't drink it, just swish it about in your mouth. Lemons cause you to produce a lot of saliva.  If that doesn't shift it, you'll have to go to a dentist because they can get painful quickly( like very, very painful  - a 10/10 on the pain scale) if it blocks the entire gland. Or gets infected.  Does it bother you after eating?

Blocked saliva glands tend to be caused by stones. Hence the hardness.

Hi Uxbridge,

A very warm welcome to our forum.

Hopefully, this is nothing serious, but you are as well to get it checked out. Why are you so worried about seeing someone about this? The sooner you see someone, the sooner your worries will be over.

Please let us know how you get on. We are always here for you.

Kind regards,

Jolamine xx