"puerperal mastitis usually occurs from infection with Staphylococcus spp. during lactation"
"granulomatous mastitis: rare; usually occurs due to tuberculosis or sarcoidosis"
"Clinically, the breast will be indurated, red and painful. Nipple retraction may also be evident. Nodal enlargement is common. The patient may often have systemic symptoms such as fever or leucocytosis."