Should I run with a Baker's cyst?

I think I have a Baker's cyst behind my knee in the backside of my leg. It's a little lump about the width of a nickel. It's been six days since I noticed it and it's still the same shape. It isn't painful but it occasionally feels like there is tightness in my hamstring. I have a doctor appointment in six days. Should I still see the doctor if it disappears by that time?