Anyone know what this white sac is hanging off my fish?

[DanMiller20201]

We’ve noticed this hanging off of our fish, not sure if its maybe a hernia?

 

[PheonixKingZ]

Possibly a tumor. Your bettas fins also look super bad. (Looks like fin rot)

 

[Dajuyu]

Stress (what other tanks mates does it have ) and water conditions those information might help ...