What is the purpose of patch testing in esthetics?

• A. To identify skin tones and matching foundation.
• B. To assess moisturization level.
• C. To identify potential allergies or sensitivities to products.
• D. To measure facial symmetry.

Answer: (C)

Patch testing is used to identify potential allergies or sensitivities to products before they’re applied more broadly. In esthetics, this helps prevent adverse reactions such as redness, itching, swelling, or dermatitis when a client uses a treatment or product. Typically, a small amount of the product is placed on a discreet area of skin and observed for 24 to 48 hours. This safeguards the client and guides safe product selection. The other options relate to color matching, moisturization assessment, or facial symmetry, which aren’t about testing for allergies or sensitivities.