It's not on the joint, but the lowest fleshy bit on his ring finger is swollen and pink.
There's no broken skin, nothing that looks like a bite and he can't remember having injured it. He can move it fine, it's just sore and annoying and hurts if it's poked.
He mentioned it last night, but said it started the day before.
I won't be able to get him a GP appointment tomorrow as you have to phone at 8.30 which is school run time and all the appointments are gone by 8.45 
What would you do? it's clearly not an emergency, but it's bothering him. Keep him off school to go to walk in centre and see a nurse? or just wait and see?