We noticed this one chick has a large soft mass growing on the one side of the chest about extra large egg size. It jiggles like jello. She is still going around with her 2 buddies but seems quiet and stands with her head tucked in. Eyes clear and size seem normal... we were thinking abnormality, did not see her get injured or anything. If she gets sick or acts weird we were thinking of putting her down. I can't do it. My son does not want to do anything involving blood (ax) What is the most humane and least traumatic to chicken and us?