While tattoo numbing cream canada are generally safe when used as directed, some individuals may experience side effects. These can include skin irritation, redness, swelling, and, in rare cases, an allergic reaction. It's essential to do a patch test on a small area of skin before using the cream on a larger area to ensure you don't have any adverse reactions. Additionally, using too much numbing cream or leaving it on for too long can result in an uneven or incomplete numbing effect, potentially affecting the tattoo outcome. If you have any pre-existing skin conditions or concerns, it's best to consult with your tattoo artist or a healthcare professional before using a numbing cream.