I have a Pekin duck that is 7 months old. She has a swelling underneath her vent. the swelling is hard, pinkish i. color and doesn't have any discharge. I've attached a picture. she hasn't been laying for a few days now and use to lay daily. she is acting normal otherwise: eating regular,normal energy level, still having bowel movements, still swims in her pool, plays with the dogs, etc. I would really love any suggestions or advice about what this could and how to treat it. This is my first time owning ducks so all of it is new to me.