Comedones

Comedones are the skin-coloured, small bumps (papules) frequently found on the forehead and chin of those with acne.

~ Open Comedones are blackheads, black because of surface pigment rather then dirt.
~ Closed comedones are whiteheads, the follicle is completely blocked
~ Larger and deeper uninflamed bumps are called nodules. They are less common on the face.