How much current was there at that time?
There is such a situation: if the current of the electroacupuncture is too large, the local discharge needle may burn or even burn more tissues. It will take some time to recover.
In this case, the color of the needle holes will be dark and will not fade for many days [with ordinary acupuncture, the needle holes will be difficult to see the next day]. If the swelling is severe, it is a medical malpractice. I need to go to the trauma department [burns, scalds].
A friend of mine solved the problem of electroacupuncture by increasing the current many years ago, which led to the advent of an important medical device.