About two months ago I had a pimple-like bump on my arm. It was filled with white stuff, maybe keratin. So I decided to pop it and it bled. After that it scabbed up and later healed. But the scar that's left behind has me paranoid because it's a reddish color. I'm setting up an appointment tomorrow for the doctor. I just don't want to be freaking out over nothing. I have naturally oily skin. I'm at the gym all the time. Could this be a cause of these skin abnormalities?