question: My left buttock is a continuing source of discomfort.  There isn't an open sore but skin at times is very red.  I'm 79 and underweight with a crooked spine and have had two back operations...at age 50 and 65.  Adding to my discomfort is a rapidly increasing inability to walk only short distances without intense back pain.  I want to remain active but it is increasingly difficult to do.  Any advice will be appreciated.  Thanks very much.