milium

n., pl., -i·a (-ē-ə).
A small, white or yellowish cystlike mass just below the surface of the skin, caused by retention of the secretion of a sebaceous gland. Also called whitehead.

[Middle English, millet, from Latin.]

(mĭl'ē-əm)
n., pl. -i·a (-ē-ə).

A small, white or yellowish cystlike mass just below the surface of the skin, caused by retention of the secretion of a sebaceous gland. Also called pearly tubercle, whitehead.

Pl. milia [L.] spheroidal follicular cyst of lamellated keratin lying just under the epidermis, which appears as small white or yellow nodule. Popularly called whitehead.

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The noun has one meaning:

Meaning #1: a small whitish lump in the skin due to a clogged sebaceous gland
  Synonym: whitehead

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