Middle of breasts skin (cleavage area) lifted up why? Tenting? (Photos)

Synmastia is the appearance of your both breast as coming together too closely.  - Often called a "Uni Boob".   The cause is often over release of the sternal attachments or if submuscular - over resection of the medial segment of the pectoralis muscle.  I would review your results with your plastic surgeon.You have a really narrow chest wall, and relatively large implants for your chest wall.   But they do look like they are medially placed.  More lateral dissection maybe helpful.

Thank you for your pictures and questions. I would say that you are developing some early symmastia. From the appearance in the picture, I would bet that pre-op, you had a very wide sternum and widely spaced nipples. In an effort to create medial cleavage and fullness, your surgeon medialized the implants pockets and this led to the lateralized appearance of the nipples and the symmastia. This would likely require surgery to repair. If your original surgeon was not board certified by the American Board of Plastic Surgery or well experienced with augmentation surgery, I would suggest now would be a great time for a second opinion by someone who is. Best of luck!

Hello, if the attachments of the skin over the breast bone (sternum) are disrupted, sometimes a tented look can result which is called synmastia.  Your surgeon will be able to examine you and determine if this is the issue.