Sagging skin/fat under my arm pit... HELP?!

It has been 1 year since her masectomy and now my moms armpit is starting to show extra fat or sagging skin around the arm pit area.

Has anyone experienced this?

She is wondering if maybe because she doesnt' have much muscle in her pectoralis muscle, it is causing this.

What do you think??? 

tell your mom to ask her dr about the possibility of physical therapy, to help rebuild/firm up those tissues

also there are groups that do water therapy for post-mastectomy women - she might see if there is a group near her - it's a lot of fun, great exercise, and a good way to get back into shape after mastectomy