u/EatPennies

I've noticed the scars under my arm pits are neat and thin, but become darker and thicker as they lead to my pecs. Is this just pigmentation/healing/etc. or have I started to stretch my skin? I've been doing push ups and light cardio.

I see my surgery team tomorrow (Dr. Faque, GCC, San Francisco) but I want to get your opinions and experiences since I know healing and results vary between people.