What is on my dogs paw?! My poor guys seems to have a large cyst on his paw, how can I treat this infection? and should I take him to the vet immediately? He is not limping or whining, he just gets annoyed when I touch his paw.

Hi There! These are pics of my 11 year old papillon’s back right foot/paw. Have noticed over the past few months that his paw pads have been red and swollen. The other 3 aren’t nearly as swollen as this one. Ive been working with his vet to try and figure it out which is challenging right now...