Thanks for reply. I just checked. When I stand I can feel the bump clearly, but when I lay down it is noticeable just slightly. Our Dojo is very small, so the instructor saw it as he was standing close by. He basically stopped our training, asked me if everything was fine. It was painful but I did not suspect any injury, so we continued with training (no contact this time). But I called him next day and told him about the bump and that I will take a week off. I do not have any info about that student, but the instructor has his information. I did not go to a doctor as I am starting new job in a week on October 28th, and I do not want pre-existing condition on my health insurance. But I guess I will go to a doctor if it does not improve shortly.