Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Vernix caseosa
Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026
Vernix caseosa: A white cheesy substance that covers and protects the skin of the fetus and is still all over the skin of a baby at birth. Vernix caseosa is composed of sebum (the oil of the skin) and cells that have sloughed off the fetus' skin.
"Vernix" is the Latin word for "varnish." The vernix varnishes the baby. "Caseosa" is "cheese" in Latin.
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