A milk cyst is a blockage in the milk ducts that causes a milk-filled cyst to form in the breast tissue. This condition is common in breastfeeding women, especially during weaning. Milk cysts are benign lesions that usually shrink and disappear on their own.

Fat necrosis of breast tissue is a benign progression, commonly seen in patients after breast biopsy, breast reconstruction surgery, and removal of breast implants. This phenomenon does not require intensive intervention. In some cases, fat necrosis forms a large mass, and the doctor will prescribe intervention depending on the condition.