Hold the tip of the cellphone-size device to your zit for two and a half minutes, and a 16-bit microprocessor emits mea-sured pulses of 119°F heat. (It feels sort of like a hot compress.) Under your skin, bacteria produce stress proteins and self-destruct, halting the inflammation that creates visible blemishes and healing the area faster than other over-the-counter remedies&8212;typically within 24 hours. $225;
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