I have a BO hen about 1 year old. She's had swelling that has gradually been worsening over the past 4-5 months located under her vent. She has been acting just fine, eating, laying eggs, foraging ect however the swelling/growth has been worsening. Tonight I aspirated a small amount of pinkish fluid from it....certainly not much in relationship to the amount of swelling. The fluid did not look infected. The swelling itself is soft and does not appear tender at all for her. Thoughts on what this might be?