Hi folks a few months ago at my martial arts training something strange happened. My instructor was demonstrating a drill and hit me directly on my right bicep. There was no unusual pain, only the sting of being hit however someone pointed out my bicep looked strange, I turned and looked and it was as if the muscle had moved up my arm or something. After flexing the arm it returned to normal and there was only a mild soreness similar to just after a workout. My arm went back to normal a day or 2 after.
Does anybody have any idea what might have happened? The reason I ask now is because I have a similar soreness in the same bicep at the moment and I am unsure if this is a result of grappling and foundation work or some peculiar injury. Thanks in advance.