Milia are small, white cysts that appear on the skin. They are filled pockets under the surface of the skin and are caused by trapped dead skin cells that form cysts below the surface of the skin. The most common place to find milia is on the face, but they can also appear on other parts of the body such as arms, legs, chest, and genitals. Milia can be categorized as either primary or secondary. Primary milia are formed directly from entrapped keratin and are usually found on the faces of infants and adults. Secondary milia are also tiny cysts and look similar, but these develop after something clogs the ducts leading to the skin surface, such as after an injury, burn, or blistering of the skin. There are different types of milia, including neonatal milia, juvenile milia, traumatic milia, and milia associated with drugs or products. Milia are usually not itchy or painful, but they may cause discomfort for some people. Rough sheets or clothing may cause milia to appear irritated and red. Milia can be diagnosed after a physical exam, and tests are not usually necessary, especially among newborns. If a healthcare provider needs to further examine the skin, they may request a skin biopsy. Milia are benign and transient subepidermal keratin cysts that present as small firm white papules in various numbers most commonly distributed on the face, but they can also be present on other anatomical areas such as the upper trunk, extremities, and genital area. Milia are usually self-limited and, in most cases, will resolve without leaving a scar by one month of life. If milia do not go away on their own or with at-home treatment, a doctor can remove them with a sterile lancet or scalpel followed by removal of the cyst material with a tool called a comedone extractor.