2 month old baby, has marks on her legs from sweat pants.?

Apparently, I didn't realize that these sweatpants that I had put on her were too tight around her calves. (you know like when your pants ride up your legs?) It left a red mark, which is now getting darker. Will it go away? (FYI- I did go to the doctors and they told me to do nothing! and eventually it "may" go away) Any ideas? --- HELP (i'm a first time mom)