Medically reviewed by Marisa Garshick, MD Milia, also called milk spots, are small, pearly white cysts that form under the skin. They develop when keratin—a protein that makes up hair, skin, and nails ...

Primary milia: these can occur in both children and adults and are similar to neonatal milia. It’s usually categorised as primary milia if there is no obvious cause or could be linked to a ...