Will Breast Implants Make Stretch Marks Worse?

Although it would make sense that stretching the skin would cause stretch marks (striae), in fact I have not seen this in my more than 25 yrs of practice and experience with thousands of breast augmentation patients. This however has been reported so is a very uncommon to rare occurrence. What I have seen however is existing white stretch marks become pink for several months afterwards and then fade.

Pictures would be of tremendous help in this instance. Given the limited information, it is my impression your stretch marks will improve with implants. They generally do. To help determine if this is the case in your particular situation, stretch the skin of the breast and see if the appearance of the striae improve. Of course, this will be influenced by the size of the implant and resulting distension of the skin.

All of the problems you are describing are the result of volume loss in an inelastic skin envelope. Your skin has been stretched and no longer has the ability to shrink around the smaller breast. The stretch marks are more visible due to volume loss as they most likely are creating a contour irregularity.
The solution to this is to replace volume with a breast implant. and depending on how loose the skin is a breast lift may be necessary. Any skin removed would surgically take away the stretch marks within the lift pattern.
More definitive answers can be given to you by a board certified plastic surgeon in a consultation in your area.
I hope this was helpful and I think you will be very pleased with the results which can be achieved in the hands of a good surgeon.