This prostate specialist awkwardly offered a fist bump to his patient
Hands come in contact with all kinds of surfaces, which is why they should be washed regularly. Physicians stick their hands into all sorts of places, so you might still find shaking their hands or giving them a fist bump unpleasant. There is nothing to worry about since those in the medical field usually wear gloves for every examination and know the importance of handwashing. However, a fist bump might not be the best greeting method.
This poor doc was merely trying to congratulate his patient for a clean bill of health. He had just performed a prostate exam, so the fist bump was probably not the best method, though. Besides, such informal greetings can feel awkward if you are not close to the other person. Trying to be more relatable is a good thing, but maybe he should stick to a handshake.