Scar tissue or breast gland after gyno surgery last October?

I had gyno surgery last October. The results were great but I began noticing a hard lump behind my right nipple that I may or may not be tricking myself into thinking it’s growing. The left side is perfectly flat and has no lump. I'm worried if it’s gland that it will keep growing resulting in an uneven chest. My surgeon is impossible to get a hold of so I’m hoping you might be able to help. Do you think it may just be scar tissue since it’s only one one side? Thank you.