Could i have breast cancer if i have an abcess that has formed on my right side nipple and it has made a big hole with green yellowish discharge oozing from it. it is also affecting my arm and under arm with extreme pain.

Need to examine: It is not feasible to provide a meaningful opinion without additional history, physical examination and may be some tests. Your doctor may suggest a mammogram. Your abscess needs to be treated before rest of your breasts may be evaluated properly. Have a healthy diet, exercise 30 minutes/day, drink plenty of water, have safe sex, no tobacco alcohol weed or street drugs.