If there is no heat or swelling and it's not changing in size then I would point it out at the next scheduled appointment or make a quick call to them. My horse actually has a knot on his leg that we are going to have removed. I showed it to my vet and she decided we could watch it since it felt like it was not a solid mass and because there was no heat, swelling, or pain. It did grow some over the last year so I am now scheduled to have it removed in Sept. It's going to cost (I love the estimate) $50 - $100 - $2000 depending on if there is joint involvement. I'm guessing around a grand...
Looking at your photos, I don't THINK it's in the right place to be a splint.... I wonder what it is?
"Be a best friend, tell the truth, and overuse I love you
Go to work, do your best, don't outsmart your common sense
Never let your prayin knees get lazy
And love like crazy"