Tiny yellowish or white bumps on the scrotum, penis, labia, nipples and lips that occur when sebaceous or oil-producing glands get clogged up. 70% to 80% of people have fordyce spots, however they are more common in men than women. Fordyce spots are usually 1mm to 3mm in diameter, or the size of a pencil point or a sesame seed. They can be loners, or crop up in clusters. Fordyce spots aren’t filled with pus like a zit might be, but they do start to form during puberty when testosterone kicks the sebaceous glands into high gear. These little bumps can give the skin a plucked-chicken look. Fordyce spots are not contagious and are not caused by a sexually-transmitted infection. Named in the late 1800s after a dermatologist named John Fordyce.