<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing some numbness and tingling in my right elbow and also noticed a lump there, what could be the reason behind it?  <response>: It seems like you have lateral epicondylitis, also known as tennis elbow. The numbness and tingling could be due to paresthesia, which is a common symptom of this condition. The lump or mass is caused by inflammation of the tendons in your elbow, and it can be quite painful. 