Small Yellow Discharge from Incision Site After Breast Lift?

Generally speaking, the most problematic area when it comes to healing after breast lifting surgery, is the area that you describe between the vertical and horizontal incision lines. Sometimes, this may consist of a small amount of drainage;  sometimes there may be delayed healing/wounds that require dressing changes.

 Given your concerns, best to follow up with your plastic surgeon for accurate assessment, advice, and/or reassurance. In the meantime, keep the area covered/clean with a nonstick sterile dressing.

 Best wishes.

It doesn't sound like there is anything particularly wrong. If however you have any concerns you certainly should bring this up to your plastic surgeon.

Some yellowish discharge from a breast lift incision is not unusual and this is just the plasma component of the blood.  With conservative management this will do fine.