Breast blisters usually break, causing a scab to form. Over time the whole thing can form a small abscess. The key is finding out what is causing her to lie down and rub the breast area to make ther scab. Here are a few links for you to read: http://www.thepoultrysite.com/diseaseinfo/99/mycoplasma-synoviae-infection-ms-infectious-synovitis
http://www.merckmanuals.com/vet/pou...ns_of_poultry/breast_blisters_in_poultry.html
http://www.oardc.ohio-state.edu/4hpoultry/t02_pageview/Wing_Rap_9.htm
http://www.merckmanuals.com/vet/pou...ns_of_poultry/breast_blisters_in_poultry.html
http://www.oardc.ohio-state.edu/4hpoultry/t02_pageview/Wing_Rap_9.htm