Ace the 2025 Colorado Esthetician Written Exam – Glow Up and Shine Bright!

Question: 1 / 400

What is the oily substance that protects and lubricates the skin?

Lipid

The correct answer is "A. Lipid" because lipids are fatty substances that help protect and lubricate the skin. Lipids form a major component of the skin's outermost layer, helping to maintain the skin's barrier function by preventing water loss and protecting against environmental damage. Sebum (Option B) is a type of oil produced by the sebaceous glands in the skin that helps to lubricate and waterproof the skin. Collagen (Option C) is a protein that helps maintain the skin's strength and elasticity, while keratin (Option D) is a tough protein that forms the structure of the skin, hair, and nails.

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Sebum

Collagen

Keratin

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