Welcome to Chordie, and congratulations on rediscovering guitar and making music.
Everyone has pain when they first start again, but if you've got some kind of a growth more than a run-of-the-mill callous then that's something different. I hope it clears up for you. Pain is the body's way of telling you to stop doing something. Most times we ignore it when it's finger pain, but it may make sense to try to use alternate fingerings for chords or try not to use that finger too much if it's at all possible to avoid. If it's not possible to avoid, it may be worth getting checked out. Maybe it's just a blister. That's be so awesome if it were. Think of that - 88 years old and playing 'til his fingers blister. How freakin' cool are you?
"Forced means you're painting a train blue." - Jets60
"If it comes from the heart and you add a few beers... it'll be awesome!" - Mekidsmom
"Don't ever apologize for what you have worked hard for." - Pete Benson
Official recipient of B chord amnesty.