Comedones are a common type of acne that occurs when hair follicles become clogged with oil and dead skin cells. There are several synonyms for this term depending on the size and location of the clogged pores. Blackheads are small, dark bumps often found on the nose or chin and are simply open comedones. Whiteheads, on the other hand, are closed comedones that appear as small, white bumps on the skin. Milia are very similar to whiteheads but are commonly found in newborns and infants. Other synonyms for comedones include blemishes, pimples, zits, and blocked pores. Depending on their severity, comedones can be treated with topical creams, facial masks, or professional extractions.