This sounds concerning and needing attention. Did the surgeon notice it on Friday? Did you mention your concerns? If it was me, I'd try and see a doctor sooner than three weeks. You might consider asking for an appointment with oncology practice/surgeon. That way, if it requires immediate action you'll get it and if not you'll have a bit more peace of mind in the next 3 weeks. I hope you get the info you need.Check back in and update us?