ALLERGY PATCH TEST
You should always patch test when trying a new product / new ingredient.
Patch tests are very easy to do. Take a small dab of a new product and apply to clean skin in an inconspicuous location.
Many sources say two good places to do this are behind your ear or in your inner elbow. Wait 24 hours to see if any redness or irritation occurs. If redness, swelling, irritation occurs, discontinue use immediately.
Simply put, a small test can save you from serious whole-body discomfort!