I have unexpected rashes and swollen fingers, what is this?

Swollen fingers: Cause of swollen knuckles and fingers and rash can be gouty arthritis, inflamm arthritides, psoriatic arthritis ( associated with psoraisis) , lyme disease, severe infections ( acute bacterial ones) or even just a viral syndrome. And others you need to be seen by your medical provider, document the rash, where its is what it looks like as it may be a clue.