Ruth knew that the whiteheads of her teenage acne were a temporary state of affairs, but that did nothing to quell her distress when an eruption hit just before prom.
a pimple formed by a clogged sebaceous gland, usually with a milky-white cap.
Hyphenation
a pim-ple formed by a clogged se-ba-ceous gland, u-su-al-ly with a milky-white cap