Fuller, Plumper, Smoother! That’s Swell! Lip Plumper gives your lips a soft enhancement. By stimulating the skin’s natural collagen, softer and plumper lips are just a sweep away. Discover the entire That's Swell! range, from cooling lip plumpers, to extra hot! Fuller, Plumper, Smoother! That’s Swell! Lip Plumper gives your lips a soft enhancement. By stimulating the skin’s natural collagen, softer and plumper lips are just a sweep away. Discover the entire That's Swell! range, from cooling lip plumpers, to extra hot!