There seems to be swelling over RT.side of chest between 5th to 8th ribs.
You are saying this swelling some times disappear. It may be lipoma ,contact to Surgeon
Your ultrasound report shows gall bladder is distended. But some part of that line I couldn't seen due lack of photo of that part.
For gall bladder, you must contact to a surgeon
Sometimes, there is costocondritis also.If Surgeon says there is nothing then go to consult to an Orthopedic Surgeon. Sometimes by worms also settle in ribs
Next Steps
Consult with a Surgeon first .If he says there is nothing, then consult to an Orthopedic surgeon
Health Tips
There is nothing to worry
But should consult to the doctors