<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi, I woke yesterday morning with a lump lodged on the top side wall and inside my bellybutton that is tender sore to the touch. It is about the size of a pea. Could it be some kind of and infection or something else. I have no other symtoms and am extremely always healthy so this is really bothering me.  <response>: Hi, I understand your concern. -A painful pea sized lump on side wall of umbilicus, may be a painful inflamed lymph node, that has arisen because of injuryinfection. - A simple lipoma which is usually painless being irritated infected by itching, massaging, pressing, pricking-may turn painful. - The painful lump can be beginning of an umbilical hernia. Here the lump grows on stresscoughing etc. A course of antibiotics anti-inflammatory Chat Doctor. But if it does not subsideincreases in size affected by coughing, you should consult a surgeon for exclusiontreatment of hernia. Thanks. 