A patch test allows you to see how your skin reacts to a substance before using it more widely. Here are the steps for performing a patch test:
- Wash your forearm with mild, unscented soap, and pat the area dry.
- Dab a few drops of diluted essential oil onto a patch of skin on your forearm.
- Place a bandage over the patch, and keep the area dry for 24 hours.
If you notice any rash, irritation, or discomfort during the 24 hours, remove the bandage and wash your skin thoroughly with gentle soap and water. Don’t use the essential oil if any reaction develops during the patch test.
If no irritation develops during the 24 hours, it’s likely safe for you to use the diluted essential oil. However, a successful patch test doesn’t mean that you won’t develop an allergy or experience a reaction after future use.
Source: Healthline – What You Need to Know About Allergic Reaction to Essential Oils