question: My grandfather a 97 year old who had a stroke over 7 years ago, paralyzed on the left side was noticed to have a lump that has grown to the size of a small egg between the crease of his buttocks an thigh. He does not walk and sits in a wheelchair most of the day. He does not complain of pain to the area. He is otherwise alert. Only med is for BP control. What could this be and what is the cause of it?Please help. Thank you