The sebaceous (sweat) glands are oil producing glands.
The oil (sebum) flows up the hair follicles to keep the hair and skin lubricated.
The glands are about 1-2 mm. They look like black heads, but are white. Hairs might stick out of these little bumps. Sometimes you don’t really notice them, but can feel them when you massage the skin.
Many guys and girls start to notice them on their genitals when they start puberty. With men they are most often seen on the penile shaft, particularly on the underside, but they also appear on the scrotum, glans and foreskin. Girls usually have them on the inside of the outer and on the inner lips.
They are a normal part of the skin’s anatomy and so they are there to stay.
Sometimes the opening of the gland becomes blocked, while the gland keeps producing oil. The sebum that is trapped hardens into a yellow cheesy lump. Like a common spot on your face or back it will disappear after a while.