Found pencil eraser sized open sore on lbreast w/pus and blood but no pain. half dollar sized swollen/raised/red around the open sore. what is this?

Get evaluated.: This could be an infection or abscess. Have your health care provider check this out; you may need antibiotics. Many skin abscesses are caused by an organism called "mrsa" - methicillin resistant staph aureus. While MRSA is treatable, it's important to get the right medication on board quickly. Lgromkomd.

See a doctor: You need to have a doctor look at it. The lesion could be a bacterial abscess, but a medical evaluation is necessary to make sure the correct diagnosis is made. Please do not delay!