A Milium also called a milk spot or an oil seed, is a keratin

Keratin

Keratin refers to a family of fibrous structural proteins. Keratin is the key of structural material making up the outer layer of human skin. It is also the key structural component of hair and nails...

-filled cyst

Cyst

A cyst is a closed sac, having a distinct membrane and division on the nearby tissue. It may contain air, fluids, or semi-solid material. A collection of pus is called an abscess, not a cyst. Once formed, a cyst could go away on its own or may have to be removed through surgery.- Locations :* Acne...

 that can appear just under the epidermis or on the roof of the mouth. Milia are commonly associated with newborn babies

Infant

A newborn or baby is the very young offspring of a human or other mammal. A newborn is an infant who is within hours, days, or up to a few weeks from birth. In medical contexts, newborn or neonate refers to an infant in the first 28 days after birth...

 but can appear on people of all ages. They are usually found around the nose and eyes, and sometimes on the genitalia, often mistaken by those affected as warts or other STDs. Milia can also be confused with stubborn whiteheads.

In children, milia often disappear within two to four weeks. In adults they may require removal by a physician

Physician

A physician is a health care provider who practices the profession of medicine, which is concerned with promoting, maintaining or restoring human health through the study, diagnosis, and treatment of disease, injury and other physical and mental impairments...

, dermatologist, or an esthetician.