Severe breast pain on right side a year after breast surgery.

Please see your surgeon as soon as possible. It is difficult to say what’s happening without an in-person examination. You’re obviously suffering from a complication that needs to be addressed immediately.

I am sorry to hear about the problem you are experiencing.  It definitely sounds like it is time for you to follow up with your plastic surgeon.  Sometimes more than one consultation is necessary to feel comfortable with a diagnosis and treatment plan. Given your description of significant size increase, I would be concerned that there is some type of fluid accumulation present.  For example, given your description of events, you may have had some bleeding (hematoma) after the "muscle pull" episode. Other causes of pain, this far out from breast reduction surgery would include the presence of fat necrosis,  painful scars,  entrapped nerves (neuroma)... Again in person evaluation will be important. Best wishes for speedy resolution of your discomfort.

Your case is way more complex than to expect any kind of reasonable assessment without a physical exam. You should see your plastic surgeon in the near future. Do not procrastinate.All the best,Talmage Raine MD