If you’re patch testing a product to see if it will make you break out, you should go about things a little differently. First, you should apply the product directly to your face on either your cheek or your chin. These are two areas that are most prone to blemishes because there’s a higher concentration of oil-producing glands. Apply your new product daily (to the same area) for a week to determine whether your skin will react. Product-related breakouts will typically occur within this time frame.