Hi welcome to Health care magic forum.
Thanks for calling H.C.M.Forum.
Your problem is diagnised as an incisional hernia
, and is due to the surgery done some time back. Any hernia is not recovered by it self. It definitely requires surgery, more over it is growing so it must be operated and repaired. As it is growing there is a possibility of strangulation of the contents.
So i advised you to consult the operated surgeon or some other surgeon for surgery and repair.
Wishing for a quick and complete repair.