What is the non-negotiable initial step when using concentrated thyme essential oil externally on the skin?

Answer

Performing a patch test using a 1% dilution or less, testing an inconspicuous area.

Concentrated thyme essential oil is a known potential skin sensitizer, and applying it topically can lead to allergic contact dermatitis, even potentially exacerbating existing skin issues like eczema. To mitigate this risk, a patch test is considered non-negotiable before widespread external application. The standardized procedure involves significant dilution: mixing just one drop of the essential oil into at least 100 drops of a suitable carrier oil. This results in a dilution strength of 1% or lower. This small mixture must then be applied to a small, inconspicuous area of skin to observe any adverse reaction before proceeding with any larger application intended for scalp massage or therapeutic use.

What is the non-negotiable initial step when using concentrated thyme essential oil externally on the skin?

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