We’ve all been there: you’re leaving the medi-spa after receiving injections, or a laser treatment, and it’s time to pay for the service. How much to tip for facial treatments? Should you add gratuity on top of the cost of this kind of service? You may have de-stressed in a relaxation room prior to the treatment—was the service performed by a doctor or nurse? We all know 15-20% gratuity is standard for the spa world, but what about this gray area we call the medical spa?