Kitty has bald/white patch

Hello! I have noticed that my sweet boy has a tiny patch of white fur that is also missing fur. I have kept an eye on it for a couple years and nothing has changed with it really. My best guess is that maybe its from being sick as a kitten? He had feline panleukopenia at around 4 months and my theory for a while was that it was from some kind of stress or trauma. I am very paranoid all of a sudden that it may actually be something more serious. I have a vet, I just don't want to take him in the car unless absolutely necessary because he gets very very anxious. Anybody know what this might be?