Breast reduction with galaflex? (Photo)

I'm coming up to 4 weeks post op and have had the the following hard line on my right side boob from the start. Yesterday my right arm started throbbing / aching like it felt strained. It started off only when I moved it, but then it just throbbed. I've woken up today and it's not only when I move it. But it's made me concerned about this hard line again. The nurse said it sounded like fat necrosis, but I'm wondering whether it's the edge of the mesh? Any thoughts?