Agree with (most) of the above.
Mallet deformity, fairly common mechanism of injury putting your hand in your pocket. Six weeks in a mallet splint (see pic above) which you MUST wear if you want it to heal. Don’t be tempted to take it off after a couple of weeks and give it an experimental bend to see whether it’s healed. It hasn’t.
When you need to clean your rank finger, put your hand flat on a table and slide the splint off, clean finger with babywipe or similar and slide splint back on, re-tape in position.
After 6 weeks of constant wearing, during which time you will wish they had just chopped the inconvenient finger off, you will get to wear it for a further two weeks whilst doing anything that might injure it…
Then comes the big reveal….. anythin less than 15degrees of bend is considered a success, anything more = operation ( and another 6 weeks in a splint)
Happy to help. (I have about 6 degrees bend in my right little finger after falling off my MTB)
forgot to say.. pop to your local minor injuries or walk-in or A&E (whichever is handiest) as it will need an x-ray to see if it is the bone or the tendon….. hope it’s the bone.