Could subpectoral steroid injections increase the size of the breasts?

Thank you for sharing your question.  The most common method of enhancing a woman's breasts is through fat grafting or the use of saline/silicone implants.  Steroid injections will not promote breast tissue growth and can cause more severe issues.   I would recommend you make an appointment to see a board certified plastic surgeon for an in-person evaluation.  They will be able to take key breast parameters, and listen to your desired goals, helping you select the best treatment option.  Hope that this helps

I would not recommend trying to use steroids to augment the breasts.  There are significant health risks that come from this.  If breast implants are not for you, I would recommend trying liposuction and fat transfer as an all natural alternative.