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My name is ***** ***** I have been a Vet tech for 30+ years.
Could Daisy Mae gave hurt herself or he chest cavity some how?
Could she have an infection?
Any breathing problems?
This sounds like Subcutaneous Emphysema, where air or gas becomes trapped in between the layers of tissues. The main causes for this condition include seepage of small amounts of air through lesions on the skin caused by some type blunt trauma. She may have hurt herself playing with kitten. Possible the kitten clawed or bit her and that could cause it. This under the circumstances is the first thing that came to mind when I heard the problem. I do suggest she sees the Vet as soon as reasonably possible to be diagnosed. If she gets worse and the swelling progresses, then an ER visit may be needed. If it was allergy it would be the whole body.