Would you be concerned about this?

I’ve hard this mark right below my knee on the back side of my leg for a while, it is red and scaly. The size of a quarter. I’ve probably had it for close to a month now. I’ve tried putting creams on it. It doesn’t hurt. Or even itch. It just doesn’t go away. I dont think it’s a heat rash or friction rash. or anything, there is nothing like it on my other leg. At first I though I cut myself shaving, I often do, but this doesn’t look anything like that. Has anyone had something like this? Do you think I should go to the doctor about it?