Nope, it's not a Photoshop trick.
I call it my Funky Finger. And if I give you the Finger, you know it!
The doctor says it's a ganglion cyst.
They usually develop where a joint has been damaged.
Apparently I hurt this finger, but I can't remember doing so!
It can be removed but 9 times out of 10 it returns.
It just has to run it's course.
So, beware of the Funky Finger!