I have small red bumps that have been appearing on my body in random spots. They look like pimples without the white tip, except they itch. Its not rash like, sometimes just one or two at a time. They are leaving brown marks where ever they appear (which seem to be staying), and I usually avoid scratching them. They other thing is that they appear in dark areas, such as under the arm, in the belly button, and in the crotch area and sometimes on genitals. They even reappear in areas they have already been. Could it be heat, some type of mite, allergic reaction? What could I do about it?