Hi and thanks for your question about Emsculpt Neo. The Emsculpt Neo uses radio frequency energy to heat tissues, specifically fat, to a level just high enough so the cells burst and are cleared away by your lymphatic system. During treatment, you should feel a warming sensation under the paddle in the treated area. The paddles are constantly measuring the temperature of your skin, and adjusting the heat, so that no injury occurs. You should not have any oils or lotions on the skin before treatment, this can increase the risk of slight blisters of the skin. Also, if you sweat a lot during the treatment, your provider should towel the sweat away to avoid blisters. If you do get a blister, it is superficial and will heal on its own, but it's best to keep it loosely covered with Aquaphore to speed healing. I would recommend no further Emsculpt treatments until the skin has healed. Hope this helps!