Where and how big would the scars be if I got breast implants?

Excellent question. Scar placement is an important decision when performing a breast augmentation. The easiest scar to hide with a bikini would be a peri-areolar scar. But all scars are meant to be easily hidden with a small braw or bikini. Most common places are:1. The peri-areiloar scar, it is hidden around the areola on the transitional skin between areola and normal breast skin, usually on the lower half only. 2. The infra-mamary fold scar, it is hidden within the breast fold. This scar might be visible if the bikini rides up or if the placement is slightly bellow the fold.Other scar placements may be trans-axillary (through the armpit), or trans-umbilical (via the belly button). Trans-axillary is usually reserved for smaller silicone implants or saline implants, and trans-umbilical is used with saline only. These are all good options if your are ok with their pros and cons. Saline implants require a smaller scar, but silicone implants feel, look and fill out the breasts much better the saline implants do. Contacting a plastic surgeon for specific info on saline verses silicone may help you decide. Best of luck on your surgery,Dr. Miguel Mota

There are several different options for breast augmentation incisions. Periareolar and inframammary fold incisions are the most commonly used. Both scars are very well concealed, even in bathing suits. I prefer the inframammary fold incision as it is well hidden in the fold, has the lowest incidence of nipple sensation change and has a lower incidence of capsular contraction. The incision is normally 4-5cm for Silicone implants. I hope this helps. 

Thank you for your question 
There is a variety of incision options
The inframammary fold where the incision made in fold under the breast commonly for breast augmentation surgery.The peri-areolar incisions are usually around the bottom of the areola. 
Also The trans-axillary incisions are in the armpit, or axillary area and others also but The best access to place very large Silicone Implants is the Inframammary Incision which is placed near or in the crease below the breast.you can  improve your scar after Breast Implants by using scars creams and getting a scar removal laser.
Good luck:)
Güncel Öztürk MD