1. What are the differential diagnoses of a lump in the breast?

Some potential differential diagnoses of a lump in the breast include:

1. Fibrocystic changes: benign changes in breast tissue that can cause lumps or cysts
2. Fibroadenoma: a noncancerous tumor made up of glandular and connective tissue
3. Breast cyst: a fluid-filled sac in the breast tissue
4. Lipoma: a benign tumor made up of fatty tissue
5. Phyllodes tumor: a rare tumor that can be benign or malignant
6. Breast abscess: a painful collection of pus in the breast tissue
7. Breast cancer: a malignant tumor that can develop in the breast tissue

It is important to consult a healthcare provider for proper evaluation and diagnosis of any breast lump.