u/Street-Butter

I’m not sure what happened but a couple days ago my dogs foot got swollen and he had trouble walking on it. We watched him and the next day he was walking fine. The day after that he had an open sore on his foot. He’s walking and acting normal but I’m not sure what it is. He licks it a lot so we put a cone on it. Should I take him to the vet or is this something that will solve on its own?