Hi and welcome to HCM.
Both male and female can have diastasis recti
. This also can be hernia
. But if you cant reduce it by pressing it can be subcutaneous lesion such as lipoma
or cyst. It can be easily removed surgicaly. If you even have great six pack it will be seen even more than now. SO visit some of general surgeons to get rid of it. Wish you good health.