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Here's a report from AAD.org on tightening skin:

"The delivery systems that these devices employ and the varying depths to which the heat is delivered are what set them apart from each other, which is what dermatologists evaluate when selecting a technology for the area of skin they´re treating," said Dr. Goldberg. "For example, the broad-spectrum light sources and monopolar RF use different size treatment tips to deliver energy to the skin. Larger tips are better for bigger surfaces of skin, whereas the smaller tips are used for more confined areas of loose skin that require a concentrated delivery of energy."