Should I be concerned? 4 weeks post op chin lipo. Dark area appearing is tight and immovable creating indentation lines (Photo)

I'm 28 days post op chin lipo. One area was particularly stiff and swollen from day one. That area now seems to be darkening and creating a tight firm immovable indentation. Is this a hematoma? Scar tissue? Normal healing? What is this? Will this go away on its own?