Breast augmentation will correct a small degree of ptosis, or droop of the breast. The key however is the postion of the nipple, the center part, in relation to the fold under the breast. You can place your finger in the fold as you stand in front of a mirror and see where your nipple falls. For an augmentation to be effective and aesthetically pleasing the nipple should fall level with the fold or anywhere above. If the nipple lies below there is a chance that augmentation will push the nipple down as the breast is enlarged. The look is not the best, and mastopexy of some form is the solution.
The scar with mastopexy is a concern and issue though we have had good success with round block mastopexy for small degrees of ptosis, say one inch or less. With the round block or periareolar mastopexy the scar line runs around the nipple only, and the size of the areola can be reduced as the nipple is lifted over and upward on the breast. Mastopexy is easily combined with breast augmentation when needed. You can find examples on the internet to help you understand the scar and healing.
If no scar is acceptable to you we suggest transaxillary augmentation or an underarm approach, and an implant that will take up the skin well enough to provide a soft natural result.
Best of luck,