Studies are mixed on effectiveness of Arnica regarding BRUISING, when started prior to and maintained during the immediate post op period.
The firmness is due to swelling, and lymphedema. Compression garments help reduce the fluid in the suctioned area, along with bruising. When my patients sufficeintly recover, I often recommend that they get a wooden roller type massager at a bed store, and use it for a deep massage. A professional massage may also be helpful to reduce swelling.