When trying a new skincare product you should always conduct a proper patch test to see how your skin might react. Here's how to do it:
Patch test for allergies
First apply the product to your inner elbow. If there's no reaction within 24 hours (although some reactions can take up to 72 hours) apply a tiny bit of the product near the area it will be used.
If it's for the face...
Try applying a small amount on the side of the neck, near the ear. If there's no reaction within 24-72 hours, you most likely don't have an allergy to the ingredients.
If after doing an allergy test, you notice any redness, swelling itching or burning, it's a no go. Stop using the product immediately! If you pass the allergy test, it's time test for break outs...
Break out check
Apply the product directly to your face on either your cheek or your chin. These are the areas that are most prone to blemishes. Apply the new product daily (to the same area) for about a week to determine whether your skin will react. Product-related breakouts will typically occur within this time frame.
A bad reaction will be very noticeable. Your skin will likely look red, bumpy or splotchy, and it will feel itchy or painful. In this case, you should discontinue use immediately. If you see any new pimples, blackheads, or whiteheads, that's another reason to discontinue use.
Did you pass the test?
If you made it past both the allergy and break out tests, and the product pretty much preforms as described, then congrats! You just found your new skincare bestie!