Possible causes of Lump or mass of breast

13 conditions can cause this symptom. Most common are listed first.

• Breast cancer (tumor) Common Urgent
• Breast fibroadenoma (benign growths) Common
• Fibrocystic disease of the breast Common
• Mastitis (breast infection inflammation) Common
• Sebaceous cyst Common
• Breast abscess (collection of pus)
• Carbuncle (skin infection)
• Cellulitis (skin infection)
• Contusion (bruise)
• Hematoma (collection of blood)
• Lipoma (fatty tumor)
• Hidradenitis suppurativa (skin swelling and abscess)
• Metastatic neoplasm (cancer spread)