Definition: An unexpected or adverse reaction that occurs during or after a nail service, often due to product sensitivity, overexposure, or mechanical irritation.
Examples: Redness, heat, swelling, itching, allergic rash, or lifting of enhancements.
Professional Note: If a contra-action occurs, stop the treatment immediately, record the details, cleanse the area, and advise the client to seek medical attention if symptoms persist.

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