I have a small, red, pimple-sized bump on my leg, about 6 inches above my knee. It has been there a few days and it has not changed in size at all. It is not warm to the touch, but it is red around it. At first, it looked like there was a white head on it, but now it does not. There is no drainage or pus coming from it. It is very painful. I have poured peroxide on it and put a bandaid with neosporin on it with no change. This is the only bump like this on my body, and I've never had one before. Any idea what this could be and what I should do for it? I am otherwise a very healthy young adult.