Hypafix tape after Breast lift: what are the pros & cons?

I assume you mean your surgeon is having you use hypafix tape on your scars now that the steristrips are off and your skin is relatively healed. Pressure on a healing scar is probably the best way to keep a scar flat and healing well. This is probably a good idea especially if you tend to have thick scars. Discuss the why with your surgeon. Good luck.

Dear lori1997,every plastic surgeon has his own postoperative protocol which he recommends to his patients. I would suggest you to discuss this with your plastic surgeon.Daniel Barrett, MD, MHA, MS 
Certified, American Board of Plastic Surgery  
Member, Am. Society of Plastic Surgery

Your surgeon probably instructed you on this so you should follow the surgeon's instructions. That said, I'm not totally convinced Hypafix tape, Steri-Strips or other taping after the first few weeks is necessarily going to change the final result. There is, however, evidence that silicone gel sheeting may help keep scars smooth and flat over time and assist in the remodeling process. For now, you should follow your surgeon's instructions.