I did it 3 times in in mode, focusing on the jaw line. It was fine until the 1st and 2nd times, but after the 3rd time, it was a bit harsh, but wow, the troubles started coming along the jaw line. Even if I tried, the real troubles continued to appear. It was like catching a mole and I suffered for several months. It was probably irritating the sebaceous glands. I think it's gone. I've definitely lost fat, but my skin has turned over and I think I've had a hard time, so I won't do it again. For your information, I've never had my skin turn over like that in my life, and my skin wasn't that weak... People say it hurts when it hurts, but don't apply too much force.