Bruising the gallbladder meridian is because there is cold poison in the body, that is, moisture. Knocking on the gallbladder meridian can detoxify, so it forces the moisture out of you. If the cold in the body is not forced out and stays in the body for too long, it will aggravate the condition and may lead to rheumatoid arthritis. So, before it gets serious, you'd better buy some Chinese medicine to recuperate, or you can make a medicated diet, which will not only cure the disease, but also benefit other aspects of your body. Of course, this is only my guess about your situation, but even if you are not for this reason, it is beneficial and harmless to take some mild Chinese medicine to regulate your body. My father is a doctor. This is my suggestion. I hope it helps you.