Breast abscess is just localised collection of pus in the breast tissue. It usually occurs among the lactating mothers due to cracking of nipples. The microbes from child's mouth gain entry through these cracks in the nipple and cause infection in the breast leading to abscess formation.
Breast is one of the areas where abscess drainage should not be deferred.
Incision and drainage have to be done and appropriate antibiotics ( depending on the culture and sensitivity of drained out pus) will do the work.
In your case I and D have been done . If there is still pus discharge, consult your surgeon ( a general surgeon is a good option) because it may need any surgical intervention like I and D once again. After that ,you may need a combination of appropriate antibiotics and anti-inflammatory medication.
High protein food like eggs, soya helps in formation of new tissue and provides resistance against infection.