What have a done to my finger and do I need to "do" anything?

[Dryplate]

It's my ring finger and the 2nd knuckle is really sore, has been for a week.

I don't remember "doing" anything to it, it just started hurting. There's nothing much to see, maybe very slightly swollen in comparison to the other and a bit red. No broken skin. But it really hurts!

I'm wondering if it's possible it's some sort of infection, but also seems ridiculously minor to seek help over.

I feel well.

No there's no way you will get seen for this. I am sure you will be fine. maybe a bug bit you or something

Arthritis?

I'm in exactly the same situation. Middle finger though , there's nothing to see but omg it's agony with any pressure on it. No injury . Went to physio who said it's not broken and gave me exercises but 6 weeks later no change .
I won't go to Dr for it but if it doesn't heal I'll pay for a private xray to see what's going on .

I'd prob have it checked, particularly if it feels hot- could be an infection or a sign of arthritis (among lots of minor things). You might need an examination and possibly your bloods doing.

Achenbach syndrome, if it's on the inside of the finger and there is slight bruising and swelling. I get it, finger goes hot and painful for no particular reason and swelling and bruising appears