The most likely cause of the aymmetry you have noticed is the presence of a galactocele. This is a abnormal collection of breast milk within a portion of the breast. This is not an uncommon occurence. The galactocele may resolve spontaneously and is not a cause for concern.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.