Colorado Esthetician Written Practice Exam

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Study for the Colorado Esthetician Written Exam. Prepare with flashcards and multiple-choice questions, each with hints and explanations. Get ready for your esthetician license!

Practice this question and more.

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

Lipid
Sebum
Collagen
Keratin

The correct answer is: 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.