Abdominal bulging out after fall

[True21]

My dad had a quadruple bypass in October. He fell on his back  at work in December and then started to notice a mass on his right side by his ribs in January. It showed up within a week and hasn't been growing since. It is large and tender to the touch. Pain feel like it's on the inside not the skin. Feels like someone is poking hard. The bulge is very itchy. It is a tingling numb. The bulge is much warmer than the rest of his body. Has already had a X-ray and CT which according to his doctor "it is nothing" but obviously it is something. When he lays down it moves inward and back slightly. He isn't have any problems with bowel or bladder. He has had his gallbladder removed so it's not related to that. Other history includes: diabetes type 2 (but is at a normal weight for his height and size now and for the past 5 years and doesn't take any medication for it), hypertension, and coronary artery disease. Doesn't smoke or drink. Works in a lumbar yard and driver. Any ideas would be helpful. Thank you

[Grreatful]

Did they do an ultrasound?  Maybe it's a hernia?  It could have popped out when he fell.  I have a hernia 2 inches to the right of my belly button that is now over an inch.  Caused from the thinning of the intestinal lining wall from previous laproscopic surgery.  They found it when I complained about a bulge I had they did the ultrasound found it.  I'm not sure though my pushed inward not back.  So not really sure.  I hope this helps some.  

[Grreatful]

Did they do an ultrasound?  Maybe it's a hernia?  It could have popped out when he fell.  I have a hernia 2 inches to the right of my belly button that is now over an inch.  Caused from the thinning of the intestinal lining wall from previous laproscopic surgery.  They found it when I complained about a bulge I had they did the ultrasound found it.  I'm not sure though my pushed inward not back.  So not really sure.  I hope this helps some.  

[Grreatful]

Maybe a blood clot under the skin but before the muscle blood had pooled in one spot and made the skin raise.  But if it itches and is hot that usually is indicative of an infection, I thought.  Did they check his white blood count to see if he's fighting an infection some where?  
Since he had surgery not sure what type of meds were still in his system, or if any of them could have caused them to make his blood thinner than normal which might have caused the blood to pool ?  Did you notice a bruise when he fell? My grandmother was on blood thinners and she had to be very careful of falls and sitting more than 15 minutes because of her blood sitting in one spot to long.  God bless, and good luck I hope they find out what's wrong with your dad.