Hiding it (TW)

I have a school dance coming up on Saturday and my dress is very figure-conforming and comes to about low to mid thigh. My problem is that my thighs are where I SH. I’m absolutely terrified that my friend I’m going with will see it if the dress rides up at all. I don’t know what to do or how to hide it. Makeup will show up on the black dress, I can’t wear tights, and I can’t have my friend finding out. Im hoping maybe the newer ones might fade a bit before Saturday so they aren’t as noticeable, but there’s no helping the old ones and the scars. Any suggestions??