Follow your own surgeon’s advice because he/ she has far more knowledge than we do. However, as a qualified herbalist I can tell you than Arnica is a blood thinner, like aspirin. While it doesn’t cause problems for most people unless they’re also on other blood thinners, it CAN do.. there are risks involved such as heavier bleeding, stitches opening, slower healing etc. Personally I haven’t started using Arnica till just now, 7 weeks post op, and I use the cream on my scars. Just be careful x