He is very concerned about a knot on his lower abdomin/upper inguinal area. He hit it very hard on a door about 3 weeks ago and it bruised pretty bad. His leg has felt semi-numb ever since, and he had some red mark lines on his upper left thigh. The spot is around 2 inches down from his belly button and 3 inches over to the left. Right below the small knot you can feel a vein going down. It is also slightly bruised which we just noticed today. We were worried about hernia/blood clot/aneurysm. We were wondering if it could be something serious where we need to seek medical attention quickly, or if it is likely to heal and should be ok.