Pretty sure I've just got some mycelium bruising here #2

Pretty sure I've just got some bruising here. Let it go for several days and it seems to stay exactly where it is. I figured if it was contam it would grow, and this ain't growing. Still, I'd love a second opinion. This is my first grow, and at long as this isn't contamination, I'd say it's a success. 🤞 #2