Breast lift without implants surgery large dent on side of breast. What could've caused this? (Photo)

Dear laedwards,
I understand your concern. However, without a proper assessment, it would be difficult to determine what is wrong. It is best that you visit your plastic surgeon for further assessment or ask for a second opinion. Only after a thorough examination, you can get proper recommendations and advice.
Daniel Barrett, MDCertified, American Board of Plastic SurgeryMember, American Society of Plastic SurgeryMember, American Society of Aesthetic Plastic Surgery

Thank you for sharing your photo. During the breast lift surgery, the breast tissue and skin are repositioned, molded, trimmed, and tightened. Without more photos it is unclear what type of breast lift was performed. Based on this single photo, it appears that either too much breast tissue was taken from that area or that the skin was not adequately resected or tightened. Many surgeons recommend waiting several months before considering revision procedures as there are contour deformities that can occur with swelling, etc. You should discuss your care with your Board Certified Plastic Surgeon who will be able to provide more information at your follow-up. Thank you for your question!

The two most common causes for dents is that your natural breast fold was lowered in that area, or you have an area of less breast tissue. A small fat transfer could be added to fill in that area. At 6 months you are healed well enough to do the transfer. Please discuss with your surgeon.