In continuing to what wisepup said, I’d also suggest a form of reiki work. It can work great even with physical injuries. It’s best if there’s a physical contact with the injury but if its not possible whatsoever then you can do it from distance too. You don’t have to tell them you’re doing a reiki session, you can just say you’ll lightly massage the area to help with the blood flow. You can use your experience in medical field to convince them.
Obviously, cleanse your self first before you mess with people’s energy field and banish. Wash your hands. You can call a healing entity to aid you.
As pup said, rub your hands together in a circular motion to open the hand chakras or check almost any youtube video to see how to open your hand chakras. It’s a visualization/intention process. You can also massage your palms and fingers, especially the tips. If they ask, just say your hands are cold and you’re warming them up. Usually you’ll feel an (unusual) inner warmth in your hands they might start to buzz and feel tingly.
You can use your own energy or draw down the universal/celestial/whatever other energy.
Don’t forget to discharge the energy at the same time, usually to the ground. The common mistake is that the healer takes in his body the condition.
Don’t focus only on the spot that hurts but the surrounding tissue/organs/parts too. Sense where the energy disruption or cluster is and draw it downwards and away from the body.
Wash your hands after and cleanse/banish again.