Short answer: put your normal amount of the cream on a quarter-sized spot on the inside of your arm or the bend of your elbow, twice a day for 7 to 10 days. That is the method the American Academy of Dermatology recommends. If there is no redness, itching or swelling by the end, the cream is generally fine for you to use.
Why patch test a cream at all?
Any leave-on product can irritate some people, botanical ones included. Essential oils carry fragrance molecules such as eugenol (clove) and linalool (lavender), and some skin reacts to them. A patch test shows you how your own skin responds before you spread a new cream everywhere.
How to patch test, step by step
- Pick a quarter-sized spot where the cream won't be rubbed or washed off. The underside of your forearm or the bend of your elbow works well.
- Apply the amount you would normally use, at the same thickness.
- Do it twice a day, morning and evening, for 7 to 10 days, and leave it on as you normally would.
- Watch the spot for redness, itching, swelling or a rash.
- No reaction after 7 to 10 days? Go ahead and use the cream. Any reaction, wash it off gently and stop.
What if I react?
Wash the area gently and stop using the product. The AAD suggests a cool compress or petroleum jelly to calm the skin. If the reaction is severe or doesn't settle, see a board-certified dermatologist, who can run formal patch tests to find the exact ingredient.
Is a 24-hour test enough?
Many people try a new cream on the inner forearm for 24 hours, and that does catch fast reactions. Some reactions take days to show, though, which is why dermatologists suggest the full 7 to 10 days if your skin is sensitive or reacts easily.
Patch testing SYLEKSA
SYLEKSA Nano Herbal Cream contains clove, rosemary and lavender oils (here is what is in each one). If your skin is sensitive, or you know you react to fragrance, patch test before regular use. Keep it away from the eye area and from broken or irritated skin. If you are pregnant, nursing or under medical care, ask your healthcare provider first. More answers are on our FAQ.
Frequently asked questions
Where is the best place to patch test?
The underside of your forearm or the bend of your elbow. The skin there is thin enough to show a reaction, and it's easy to leave alone.
Can I patch test on my face?
If you plan to use a cream on your face, some dermatologists suggest a small test near the jawline after the arm test passes. Avoid the eye area.
Does a patch test guarantee I won't react?
No. It lowers the risk a lot, but skin changes over time. Stop using any product that irritates you.
Source: American Academy of Dermatology, "How to test skin care products".